Hi
I have got 68 camaro with LS6 engine. I have been having stalling issues or even the engine dies when taking my foot off the gas pedal and press the clutch and brake to slow down at the stop light or sometimes stalls when at complete stop. This happens with and without the A/C on. Other times when coming to a stop light, the engine wants to stall but the rpm picks up again.

the car has a cam but not sure about the specs as it was there when I bought the car.

it also has FAST 92mm intake.

did the dyno tuning a few years ago but not street tuning.

last month, I had to retune the PCM after installing LS3/LS7 style MAF sensor and did the dyno tuning as well and lowered the rpm from 800 to 750RPM

I test drove the car, and noticed the stalling was worse and was coming more frequently.

The changes I made afterwards hoping to address this was the following:

-Replaced the stock throttle body with FAST 92mm to match the FAST 92mm intake manifold

- Replaced IAC,TPS,MAP sensors with new ones.

-Replaced the oil cap breather with OEM type oil cap and connected fresh air hose from the throttle body to passenger side valve cover.

The above mods helped a bit with stalling issues mentioned above but the problem did not go away completely. Also, after a long drive, noticed fuel pressure dropped a bit to around 46psi from 50psi (pressure gauge at Aeromotive fuel pressure regulator with vacuum reference connected from Intake manifold)

Honestly, I am not sure what else to look for or the car has to be street tuned to pin point exactly what the issue is

will appreciate your input guys

 

Moved to PCM section. Will get more looks over here.

 

Thanks

 

Anybody willing to help?

 

I had similar issues. More of an idle hang after a tune. I "disabled" throttle cracker and all is good.

 

Thanks, I do not have Idle hanging issues. The issue is the engine dies when letting my foot off the gas pedal and slowing down to come to a stop. It also happens the moment I turn the steering while reaching to a complete stop

 

Check for vacuum leak. Looked for cracked PCV hose etc

 

I have LS6 valley cover with built in PCV. There is a cross over hose (U shaped hose) between the valley cover nipple going to intake manifold. However, I did notice some yellowish stains/leakage between upper and lower parts of FAST intake manifold. The same stains noticed also between the intake and heads. Most likely the stupid rope seal & gaskets are bad which cause vacuum leak.

Anyways, went ahead and ordered new seals. Hopefully this will address the stalling issues