Join Date: Apr 2008
Location: Beeville, TX
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are those original injectors? One of them could be getting weak, and only works well when you increase the high pressure oil pressure. My brother's truck does that a bit. The other thing it could be is your HPOP/regulator or ICP sensor. All of those have to work in concert to make your idle smooth. If one is not working right, then the truck might still run, but with a slight variation.
If you can get a good scanner to check your ICP and do a contribution test, that might tell you where you have a problem.
Eli Benson - EMT, Ambulance Mechanic
'08 F350 Dually KR - Spartan'd
'07 F250 CC SB 4x4 XLT - SCT /w Innovative Tunes
4 '09 & '10 E350 6.0l ambulances
1 '08 Duramax 6.6 (LMM) van ambulance