Regarding John 8:58
Trinitarians like to conect John 8:58 with EX 3:14.
KJV EX 3:14 And God said unto Moses, I AM THAT I AM: and he said, Thus shalt thou say unto the children of Israel, I AM hath sent me unto you.
'Ehyeh asher ehyeh' - 'I am that I am'
The King James version of the Bible translates the Hebrew as "I AM THAT I AM" and treats it as a proper name for God. Now, wether or not God Almighty was stating a form of his name or he was expressing a phrase is argued. A better renderings might be "I will be that I will be".
Here's some links to RRD's posts on this
John 08:58 and Ehyeh
http://reslight.net/forum/index.php/topic,178.0.html
John 08:58 - "I am" - Eternal?
http://reslight.net/forum/index.php/topic,304.0.html
also related:
Is the Holy Name "the Eternal"?
http://reslight.net/forum/index.php/topic,501.0.html
EGO EIMI at John 8:58 by Dr. Jason BeDuhn links
http://reslight.net/forum/index.php/topic,449.0.html
Here's clips from pages that should help also. I recommend reading the whole pages though.
John 8:58 - Did Jesus Use the Holy Name?
....... Actually, Jesus says nothing about claiming that his name is EHYEH of Exodus 3:14. The contextual discussion was concerning Jesus’ age, not his name .......
http://sonofyah.wordpress.com/2008/10/12/john8-58/
“I am†in John 8:58 and Other Verses
...............When Jesus told them: “Abraham rejoiced to see my day; and he saw it, and was glad,†they replied that He was not yet 50 years old, and how therefore could he have seen Abraham (who died over 2,000 years previously)? He then let them know that his existence was not limited to the years he was spending on earth. Jesus told them that his existence was unbroken from eons before Abraham’s day, and was unbroken thereafter. Hence he could truly say: “Before Abraham was, I am.†Now if he had said he “wasâ€Â, he would have implied that he existed, but no longer exists.
Regarding this, Paul Johnson [a Hebrew and Greek scholar] states in his book Creation: “Please notice the expression, `I am’  present tense. Why this? The expression is a Hebrew idiom and is used to express a non-terminated existence, i.e., the existence that Jesus as the Logos had before Abraham lived had never up to the time of His speaking in this text come to an end.† page 45. .............
http://godandson.reslight.net/?p=253
“I am†in John 8:58
.....The purpose is to make the claim that Jesus is a person of triune God. Actually, there is nothing here, or anywhere else in the Bible, about God existing as three separate and distinct persons. Such an idea has to be added to, and read into, what Jesus said.
Was Jesus in John 8:58 quoting from Exodus 3:14? The name in Exodus 3:14 by which Yahweh spoke of himself in its full form is usually transliterated as “EHYEH ASHER EHYEHâ€Â. Its short form, which also appears in Exodus 3:14 is simply EHYEH. Was Jesus saying in John 8:58 that his name is EHYEH? Actually, no. The expression in Greek that Jesus used is often transliterated as EGO EIMI. Did Jesus say that this was his name? No, there is no discussion concerning Jesus’ name in John 8:58 nor anywhere in the context. Rather, the discussion is concerning the age of Jesus.
Jesus expressly shows that he is not the only true God who sent him in John 17:1,3. Since there is only one true God, then Jesus, being sent by the only true God, is not the only true God. The only true God who sent Jesus is the One who identified Himself as EHYEH ASHER EHYEH in Exodus 3:14,15.
Exodus 3:14 - God said to Moses, “I AM WHO I AM [EHYEH ASHER EHYEH],†and he said, “You shall tell the children of Israel this: “I AM [EHYEH] has sent me to you.â€Â
Exodus 3:15 - God said moreover to Moses, “You shall tell the children of Israel this, ‘Yahweh, the God of your fathers, the God of Abraham, the God of Isaac, and the God of Jacob, has sent me to you.’ This is my name forever, and this is my memorial to all generations.
EHYEH and YAHWEH are simply two different forms of the same name.
......
http://reslight.wordpress.com/2007/09/1 ... -john-858/
“I am†in John 8:58 and Other Verses
.........Nevertheless, many claim that Jesus was referring to himself as the “I am†of Exodus 3:14. In reality, there is nothing in John 8:58 to warrant the conclusion that Jesus was claiming to be Ehyeh (or as some perfer, Ehyah) of Exodus. Jesus simply responded to the question: “You are not yet fifty years old, and have you seen Abraham?†Thus, the real thought of the Greek used here is that God’s created “firstborn,†Jesus, had existed long before Abraham was born, and that he was still in existence. - Colossians 1:15; Proverbs 8:22, 23, 30; Revelation 3:14.
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http://godandson.reslight.net/?m=200902&paged=2
Immutability as an Alleged Incommunicable Attribute
.........Exodus 3:14: God said to Moses, "I AM WHO I AM," and he said, "You shall tell the children of Israel this: "I AM has sent me to you. One could read into this scripture the unchangeableness of Yahweh, but this would depend on the meaning given to the Hebrew phrase "Ehyeh asher Ehyeh", translated "I am who I am" in the World English Bible translation. ...
http://reslight.net/trinityimmutability.html
If you'd like to read lots of other's ideas you can just google/or other search engines "Ehyeh asher ehyeh".