ok let's see if you guys can help me out with this. The car is an 88 IROC. 350 TPI, mods: S/R heads, edelbrock headers, catback, T-56 and Superram. I can make the car stall everytime if I do this:

Drive with it in 1st gear bring the RPM's up to 2K then let off the gas and let the car slow down a bit then push in the clutch. it will drop down to 500 RPM's and stall everytime. any ideas?

 

Have you checked and cleaned your IAC? Mine did the same thing until I cleaned the it. (Idle Air Control)

 

Yeah like a million times. After more research I found it only does it in closed loop.

 

sounds like a vacuum leak, my Formula (87) did the same thing and i figured out it was a blown intake manifold gasket...

good luck
Josh

 

I was hoping against that but now that I think about it, it started after the Superram was put on.

What is the best way to check for vacuum leaks?

 

ok, get ya a can of starter fluid, fire up the car, and slowly spray around the base of the intake. if the car suddenly revs up then there's your vacuum leak...

good luck
Josh