Walking into this one tonight(not getting paid for this) From what he's concluded the injectors stop getting the ground signal from the pcm with the tps plugged in(Cable TB) once he hits 1340rpms and won't give the ground signal again until 950. I'm heading up tonight to scan it with hptuners to see if I can figure out what's going on. Apparently when he unplugs the TPS if revs fine. I don't see anywhere in the wiring diagrams where these cross or could provide a false ground. Vats maybe not shut off completely? I wouldn't think it would care about tps though. Any thoughts on where I should start with this one?


His description:
"Starts and runs great until I hit the gas. If you hold the throttle with steady pressure it revs to about 1340 rpms then it shuts off the injectors until about 950 rpms. Sounds just like a rev limiter, but way lower rpms.

Motor is 2006 LS2. Intake, ECM& harness are 01-02
Confirmed the motor is a 24x-4x crank and a 1x cam.
Fuel pressure is good
All sensors look like they are working on the lab scope
ECM has all security deleted and is stand alone
Even installed the ECM into a friends 00 pick-up and it works fine.
Confirmed when it does this the spark is still good.

I gave up and took it to a mechanic, now he is ready to give up.
Please help!"