Now I'm not usually one to post up for mechanical help, but I'm a little stumped...

I'm having a rough idle. It is amplified with the AC on, obviously. Truck runs great above 1500rpms. I did the seafoam treatment 2 times yesterday without any change. I checked for vacum leaks by spraying brake cleaner on all vacuum lines. Problem is...I have NO idea where my PCV valve is...I know it needs to be replaced, it's origional and I'm at 93k miles.

I did plugs about a year and a half ago, but I'm going out to do them now. I unplugged the IAC and it idled down, so I know that works. I just cleaned the MAF about a month ago, but when I unplug it, it doesn't do much, when I plug it back in, it stumbles for a second then goes back fine. I just did my fuel filter a few weeks ago too...I have fresh gas in the tank.

I am thinking coil pack? I just don't know because it runs good at 1500rpms and up, and no decrease in MPG????

I'm stumped.

 

Did you clean the idle speed motor or whatever its called in the throttle body?

 

Yes, i cleaned it.

Well so far so good...I replaced all the spark plugs, they were pretty disguisting. They all had gunk and stuff on them. I replaced them about a year and a half ago, but didn't put two and two together. So, so far so good. We'll see how the day goes, I ran it for about 10 mins and it was really smooth.