idle rpm changes

[GnFnRs]

hi. i have an 03 excursion with 104,??? miles on it. just had the egr and oil coolers replaced. everything has been fine since. but now sometimes sitting at long lights or in lines at drive throughs it will idle down to below 500 rpm and almost die then jump to almost 1000 rpm then back to normal. doesn't do it all the time just maybe a few times a week. any idea's on this one?

[TommyBoy#1]

did it do that at all before

[dxusmc]

First..I'd like to say how do you get lucky enough for drive thrus to not tell you to turn your truck off? I swear if I'm going to taco bell, I have to turn off and restart my truck at least twice each time..3 times if they have a separate payment window.

2nd..I have a few theories, but I think this one is better for a tech to chime in on. I don't want you running around looking at things that could be perfectly fine, but could cause this problem so here's a

[Ozone-etr1]

AIR IN FUEL

[southern7.3]

Originally Posted by Ozone-etr1

AIR IN FUEL

Doubt it .

[Ozone-etr1]

mine did it,all i'm saying

[southern7.3]

Originally Posted by Ozone-etr1

mine did it,all i'm saying

Didn't mean to sound like an @$$. Everytime I had air in my lines the truck would barely run. Sounded horrible..

[Ozone-etr1]

Originally Posted by GnFnRs

hi. i have an 03 excursion with 104,??? miles on it. just had the egr and oil coolers replaced. everything has been fine since. but now sometimes sitting at long lights or in lines at drive throughs it will idle down to below 500 rpm and almost die then jump to almost 1000 rpm then back to normal. doesn't do it all the time just maybe a few times a week. any idea's on this one?

hmmm sounds alot like this^^^^^^^

[GnFnRs]

it might only do it twice in a week.but then the next week it might do it at every stop light.for that day

[tomtom]

I am very interested if anybody else has had this problem. It has been a recurring nightmare for me for several years on my 03 f350. 19 injectors, ficm, head gaskets, egr, icp, and a lot more stuff over the last 6 years. I have always tried to maintain this truck properly and yet I can't get the thing to idle right.