tealfastback69

Ever since i had my oil changed (yesterday) by somebody else my idle speed keeps changing within +/- 200 rpm when im stopped. And then when I put it in park the rpms go up to a higher idle than ever before. They must have messed with something so do you guys have any clue what they could have done? Is there any needle they could have adj when under the hood? Please help me out thanks.

LynnBob Mustang

Why would they mess with anything?
It is probably just a coincidence that something else went wrong or bad just after.

Lynn

cliffyk

Did they disconnect the battery for any reason? This would reset the KAM and cause the PCM to have to relearn the idle air and long term fuel trims--among other things...

tealfastback69

no the battery wasnt disconnected. i know its strange but in past experiences i have gotten jipped before...
are there any intake or air/fuel adjustments that could be changed with a screwdriver or anything on these cars?

black35th

Sound like your Idle Air Controller (IAC) is starting to crap out. Probably just a coincidence that it happened right after the oil change. There's not really anything that they could have done to mess with the idle of the car.

2000AZ5.0GT

nope, you need an electronic tuner to change anything like that

devongarver

+1 for bad IAC. i just replaced mine yesterday.

But take yours off and clean it with choke/carb cleaner first before you buy new. I cleaned mine and it worked but i had already ordered a new iac and it was in the mail the next day lol.

Sxynerd

it's "gypped" not "jipped". If you're going to use a racist word, at least have the courtesy to get it right.

WhiteFoxGT

Well before you go replacing parts, check the oil level... If its over-full by too much it will could cause a rough idle.

tealfastback69

Thanks everybody, I'll check the IAC and oil level today.