Rough Idle-s14 sr20det auto ecu

[rnkelly]

When engine is cold and start the car I need to give it some gas to start and prevent it from stalling. Runs perfect when not at idle and once it's warmed up it idles pretty good. However when I lay off the gas and the engine should go to idle the rpm drops below idle rpm but then catches an instant later to idle normally. Getting worse now that outside air temp is dropping!

'98 s14 Blacktop sr20det 5 spd---> with a stock auto ECU

Is this because I'm running an Auto ECU?

Thanks!

[rnkelly]

Or...would it be related to deleting of the coolant lines on my Throttle body? KA Throttle body btw.

[Killa_D]

it could be a boost leak or a bad temp sensor or just adjust the air temp sensor..

[klits562]

Check your idle air control valve