so im having this same exact problem... except my rpms dosent go all crazy like his but the sound and everything else is the same... could ti be the fuel pump?

 

yep could be fuel pump. sounds more like a icm

 

i bought a brand new icm and i just bought and put in an igniton lock cylinder and i am going tomorrow to make a key do u think this will fix the problem?

 

is that where the power stops? could be,,,

 

im pretty sure that is where... but im having a little problem the Gm key that i got will fit into the igniton but wont turn... im starting to think that gm cut the key wrong? because my blank key that i had them copy the pattern fits and turns the igniton on but obviously wont start the car because of vats. so i got a gm key that had the correct vats reistance and the pattern and it wont turn once i put it in the ignition?? did the dealer cut my key wrong?

 

compare them, may be a burr catching on a tumbler

 

whats a burr? plz expain

 

a small piece of the key thats sticking out and catching on things. sometimes when they grind it it leaves pieces hanging.

 

ok so i havent gotten the time to go back to the dealership but i found a way to put the gm key into the igniton and try to start it. i put the blank key in and turned it a little bit just past the lock position took it out and put the gm key in. I got the same result a blinking security light and i also got a clanking noise from the passenger under dash?