Car stalling when pressing foot on throttle?

[rfultz2]

I just replaced the ecu in my car, and now I have a problem where the car stalls sometimes when I hit the gas the rpms will drop significantly sometimes cutting off and then it'll spike if it doesn't cut off. Kind of like a delayed reaction, but this only happens when car is in neutral going into first or revving in neutral with car parked.

[green-lantern]

What year? The ECU you put in might have bad/leaking caps.

[rfultz2]

1992 theres no CEL, and I had a shop put in the ecu and order the ecu

[stealthee]

I'm wondering if the IAC is bad.

[rfultz2]

It idles fine though just when i put my foot on the accelerator it'll die if the rpms are less than 1k i noticed just now when rpms are at 1k it dips to 200 for a second and then it goes but if its less than 1k itll hit 0 and stall

[stealthee]

My first suspects would be IAC, MAS, or SAS.

[rfultz2]

Mas? Sas? Talking bout maf?

[stealthee]

MAS is Mass Airflow Sensor

SAS is speed adjustment screw (or something like that) It should NEVER be adjusted, but if it is it can be reset.

At the bottom of the page at this link tells you how to adjust the SAS. Also how to adjust the BISS is on that page

Engine: Adjust Idle Speed - 3000GT/Stealth Wiki

[rfultz2]

MAS is Mass Airflow Sensor

SAS is speed adjustment screw (or something like that) It should NEVER be adjusted, but if it is it can be reset.

At the bottom of the page at this link tells you how to adjust the SAS. Also how to adjust the BISS is on that page

Engine: Adjust Idle Speed - 3000GT/Stealth Wiki

Shouldnt the mas throw a code?

[stealthee]

Anything is possible and it may not. The SAS would not throw a code though.