Here is the low down..

Running Atomic LS for fuel, ecu and ignition

Stock coils and injectors

Car falls on it's face and dies on it's way down from anything over 1/4 throttle it dips to about 300 rpm then dies or falls directly to its death.

Car is fine other then that. No error codes etc..

Any help would be great.. BTW, everything is new, every sensor, the entire harness... Engine, everthing.

The Valve Cover vents are open to atmosphere right now, with the ports on the TB and manifold blocked off..

 

I just found an open vacuum port on the TB I missed... I will plug that up and report back.

 

Not this... wasn't a vacuum port.. Was a coolant passage to the TB.

Still stumped. All the vacuum lines are plugged..

 

my 01 camaro had this problem, but only after WOT. never found an answer, and shortly after finding out that this happened, i spun a rod bearing lol. not saying this will happen to you, just my experience. for a bit of reference, i had ported/polished/milled ls6 heads, a torquer v3 cam from TSP, intake and full exhaust. however my tuner sucked, so consider a retune. but my recommendation would be posting your problem on ls1tech. those guys are awesome.

 

Made some headway today and am back in touch with MSD.. If I unplug the IAC the car does not malfunction, so I know I have an issue there. The engineer I am dealing with at MSD is going to send me a new patch with a Beta test for the return to idle.

My engine is literally brand new out of the crate so I hope and doubt there will be spun bearing issues.