Ive had my blower on for about 2 weeks now and I just encountered a pretty annoying problem

Stock injectors, Cartech FMU, AEM FPR....

Cold start, either after a night of sitting or a couple hours, as the cars warming up I feel the car stumble at idle...Probably when the car is half way between C and H as its warming up and I only feel it when I stop at a light or stop sign and its not instant...I have to sit for about 15 seconds then it starts...the steering wheel shakes and the entire car stumbles...if i give it some gas it goes away completely and doenst happen at all when the cars warm...

what do you guys think ??
Im clueless on what it could be ?? possibly the cold idle setting on the throttle body...BTW: the thermostat is NEW

When it happens the EGT temps are at about 400-500 as its warming up and the Fuel pressure is fine at 34...and vaccumm is fine as well

-matt

 

im encountering the same thing, try raising your idle. The reasoning behind this is that the blower is taking some power to turn, like having your a/c on or something.

 

Well once the car is warm, it goes away....its only happening half way threw warm up...and the entire block doesnt need to be cold either, just needs to be at fast idle, C on the temp gauge

-matt

 

When it's warm the ECU has more controll being in closed loop. Alot of drivability problems happen in Open loop where the ECU can't controll Idle quality thus causing a rough idle or stumble. Try raising the idle a little bit every morning and see if it helps. The ECU will subtract the amount you raise it in closed loop.
~Scott

 

Well what do you guys have your idle set at ??
that little plastic screw on the IACV regulates the idle correct ??

-matt