txmustang88

hello mustang guys, im new to this and i was hoping i could get some help. i have a 91 mustang with a 302, i pretty much have evey 93 cobra bolt-on, on it as possible. well heres the problem, when im at a dead stop like a red light or stop sign, my rpms start bouncing! ive changed my throttle control censor and ive changed my sparkplugs and rotor and cap and i bought new wires and i dont have a vacuum leak. i dont kno what else to do! any help would be very appreciated! thank you.

mattdel

replace the Idle air control valve, or IAC.
Cylindrical thing on a 45 degree angle, bolted to the front of the throttle body.

txmustang88

o im srry i forgot to mention i changed that also. i dont kno what else to do

mattdel

does the idle ever catch itself, or does it continue to bounce until you take off again?

txmustang88

yes when i changed both of those censors, like it helped out aliitle. and now it does it somtimes. it will bounce then stop then itll do it agin. like when i step on it and come to a stop its ok. but when im cruising and come to a stop it will do it agin! almost as if somthing heats up!

chickenbutt

what kind of injectors you runnin?

txmustang88

ford racing 24lb

Twotone93stang

fuel pressure possibly that was my problem. I dropped mine lower and it runs great now

chickenbutt

stock mass air??