91LXStang2727

It seems that when its cool or cold that my car idles at 1500-2000k. But when its warm out it stays at 900. Why could this be?

93must

TB sticking open a little, Check for gunk built up in it! Or your cold air bypass?

REDS 5.0

Mine did this also, changed the coolant sensor= best it ever idled!

95gt4me

how rough is it????

91LXStang2727

Not sure exactly wut u mean. It just stays at 2000. Sometimes it starts at like 1000 and rises to 2000 like im holding down the gas pedal.

Black Snake

Yea its going to do that your idle is going to jump kinda high for the first couple secs, then it will drop down, thats the function of the Idle air contraol valve

91LXStang2727

It takes me a half hour to go to work and it does it the whole way when its cold only though. It just stays at 1500-2k.

Black Snake

Sticky IAC or dirty Maf or dirty TB

jthorn9

Yea I'm gonna say check your iac valve and sensor as well as the maf sensor and it could even be the thermostat. In other words, bring it to a shop and have them do a dianostic check and see what they come up with.