I have a 1987 Camaro with a 305 TPI engine...Just swapped from carb (LG4) to TPI. It is a MAF system of a 1988 Camaro... The car starts easy and runs great for a while, but I am having a lot of idling problems. The car stalls also if I have been driving for a while and going to brake a lot... any ideas??..I know many of you will say vacuum leaks...I don't have any check valve from the plenum to the brake booster. Will that affect anything?..though I have a vacuum hose going there... I don't have any hose going from the throttle body to the crankcase ventilation, will that affect any of the idling?? Also I have adjusted the IAC valve a couple of times and still it is idling a little bit erratically I think...900RPM to 1300RPM in PARK.... The car is also very close to stalling when setting gear to DRIVE and stay with full brakes... any ideas??

If you tried cleaning the IAC and it did not work, try replacing it with a new one. Went the same route with the poor idle & stalling and after replacing the IAC and reseting the idler no more problems. Idler sits at 550/600 all day long.

It is a brand new IAC valve..

Well back to the drawning board......Then.

yes.....yes it will

are you sure??...Isn't that just for letting the crnkvase get fresh air???

I have same question. Same problem. Motor idles around 900 RPM-s and as soon as I put it on gear it dies.
MAF is new, TPS is new, IAC is cleaned and also tried anouther one...nothing! Idle timing is around 8-10 degrees ( with wire not connected )
It also "throw back" sometimes to exhaust when hit throttle
How much have to be normal vacuum read at idle? And can I use vacuum line from intake to read manifold vacuum? ( it have Holley Stealth Ram intake )
Thanks