davemc2672

I wanted to post the fix to my issues that I had with the truck. It has over 100k miles on it. The check engine light came on and the engine started to surge between the 50 and 60 mph. It eventually became worse over time and would surge or become sluggish at all speeds. That eventually led to the CEL blinking.

Here are the codes that were read: P0171, P0174, P0303, P0301, P0316

Steps to eliminate and fix:

1) Replaced the fuel filter
2) Cleaned the throttle body
3) Had the fuel injectors cleaned
4) Cleaned the MAF sensor
5) Replaced the air filter
6) Replaced the spark plugs and wiring
7) Replaced the coil pack

If the CEL comes back, you most likely have a vacuum leak in the top of the engine where some pins can warp over time.

BIGxREDx2003

i have the same problem but no CEL! ive replaced the pcv hose, spark plugs, and air filter. im gonna change the COP's and clean the maf sensor next...such a pain in my @$$!!!

BIGxREDx2003

when i changed the spark plugs and then the pcv hose the problem almost disappeared but came back slowly getting worse within a couple days....

BIGxREDx2003

My cel finally came on its was a misfire cyl 1, replaced the coil and runs like new

Chacka

Mine had a bad egr, but you couldnt feel anything. I had a CEL on and thats what it said it was. My truck ran perfect so I just left the light on.

Good old Bill

Codes PO171 & PO174 pertain to lean mixture bank 1 (Pass side) and bank 2 (Drivers side). There is a TSB for this repair pertaining to replacement of the intake plenium isolator bolts and seals. Had this same exact problem with my 02 4.2L. A 20 minute fix which takes 3 Hours. Am at the library and code access book is not available for me to help with other codes. Good Luck.