CEL is on codes are PO171, PO174, P1150, P1151, P1131... truck runs rough idle when cold and every time you come to a stop light idles down like a stroked motor and will die. Problem is bugging me need some direction on what to look for! Here's some info about the truck: 02 5.4, cold air intake, tbs, custom exhaust with high flow cats, truck was originally California emissions and didn't act up until exhaust work was done and cold weather hit. Thanks in advance for all advice

 

These were a couple places to start your search.


http://www.f150online.com/forums/v8-...they-mean.html

http://www.fordf150.net/forums/viewtopic.php?t=8376

 

I've checked all vacuum hoses ect for leaks even sprayed around the intake no signs of leaks there either. That's why I'm stumped

 

Anyone else ever run across this issue?