Strange idling problem..

[huskyfan23]

I left my X on earlier today, it was on sort of a hill, when I went to get my mail. When it was idling I noticed it would almost shut off, then go back to idling again. It did this 4 times within like 45 seconds. I had a full tank of gas, and it drives fine, this is the first time I noticed when in park it does this. Anybody know what may be the problem?

 

[boominXplorer]

im pretty sure you know all the maf and iac cleanigns and stuff so... how old is your fuel filter?

 

[huskyfan23]

im pretty sure you know all the maf and iac cleanigns and stuff so... how old is your fuel filter?

Yeah I know about all that, may try that tomorrow, though I cleaned the IAC a year ago and the MAF is only a few months old. The fuel filter is also a year old.

 

[TSTONE]

i had a similar problem with my X and my mustang - both cases - TPS bad
might want to try it - they're cheap enough

 

[huskyfan23]

I'll think about that. I'll clean the MAF and IAC tomorrow. When I went to work today, I was pulling into my parking spot, and the X died completely. CEL came on and I was just rolling. Shut it off, started up fine. I'm gonna run my scanner and pull the code(s) tomorrow also. I'm assuming it's some sensor, as it just happened out of nowhere.

 

[huskyfan23]

Started up from a cold start and ran the codes. Passed fine. I went to the store, and when I got back home, pulled the codes again. This time I got 136 and 172. 136: HEGO (HO2S) sensor fault, always lean. 172: HEGO (HO2S) sensor fault/lean. I'm assuming an O2 sensor went bad? I replaced these when my headers went in (little over 2 years ago). A search told me it could also be the MAF. I'm getting ready to hook up my factory MAF and see if that fixes it. EE you better not fail me with your Pro-M I noticed when I'm not giving any gas, it starts idling differently. Today after sitting in my driveway for a minute it died completely, no CEL at all. Maybe it's just having trouble idling because of all the power (LOL)!

 

[huskyfan23]

Reset the computer and swapped the MAF's. So far so good. I'm gonna clean the Pro-M and put it back on tomorrow to see if it's the circuitry or just a dirty sensor.