Help! Car stalls when cold

[hoju1301]

Hi there, I have a '94 Q45 that stalls out when comming to a hard stop when cold to fully warmed up {Drive car after needle hits 3o'clock position on temp gauge from cold start}. I have to feather the brake and roll the car gently to a stop or else it stalls. After a driving for a while the problem temporarily goes away. However it will still stall if doing a hard emergency stop to 0mph. ----This all happened after doing a valve cover job. All intake components have been recently cleaned. I have also used BG44k recently. The car has 138k on it--After the valve cover job the car idled very high at around 1100rpms, so i bottomed out the IAC screw and set it out 3 turns, so hot idle is at 650rpms approx. Sometimes the car will "hunt" hot idle down to 500 and go as high as 700rpm when stopped.---The MAF has just been replaced and the problem still exists. Could it be due to a bad/stuck/dirty IAC valve? Or a bad throttle position sensor? Vacuum leak?

Anythoughts on what the problem could be?Thanks in advance!~Anthony

[hh11011]

Try to re-clean connections to the MAF and CAS.9 out 10 times that is all it is.hh11011:ylsuper

[hoju1301]

Ive cleaned all the electrical contacts to coils/maf/cas/power transistors. Still doing the same thing.Anythought Q45tech?Thanks!

[elwesso]

From the FSM, heres things to check, in order of priority... BTW if you dont have a FSM email me!

fast idle camIACPowerbalance test (to test injectors)Ignition coils/fouled plugsFuel pressure

Email me for the FSM!

[Q45tech]

Tee the fuel pressure vacuum line and make sure it has 18" HG vacuum at hot idle.

[hoju1301]

Thanks everyone, ill be taking the car to the dealer for a full diagnostic. I'll post the consult results when i get them. thanks

[Q451990]

From the FSM, heres things to check, in order of priority... BTW if you dont have a FSM email me!

fast idle cam

Don't ever adjust anything on the throttle body!

I know you said you'll be taking it to the dealer for diagnostics, but I just wanted to stress this... TB screws are almost impossible to set back correctly after they've been turned.

Heath

[hoju1301]

The TB was never touched when we were doing the DIY plenum/valve cover job, unless the dealer messed with the screws. ill take a look at the white marks on the TB screws to make sure they havnt been turned. Thanks for the heads up!

[elwesso]

Sorry I messed that up... When i said FIC, i meant to check its operation meaning smoothness and if it goes back down.

HUGE NONO to touch anything on the TB!!!