Rebelfan10

I have been having some trouble with my 99 GMC serria. The code scanner says the number seven cylinder is misfiring. I have changed the plug and wire and the coil is firing. A guy at the auto parts store said that his did the same thing and that it was "trash in the fuel injection system." So I changed the fuel filter and add some red line fuel injector cleaner. I am still having the problem.

The truck seems to run fine at highway speed, but ideals like crap and lunges back and forth when stopping.
I am going to try and pull the injector and clean it.

Has anyone ever seen this problem before? Am I on the right track? Any help will be greatly appreciated

99pewterZ71

iTrader: (1)

I've been through the same thing, the injectors are disk style and the trash is easy to clean if you take the injectors off, its actually really easy on these trucks, a few bolts and undoing a couple of fuel lines and the rail and injectors are off. I cleaned mine with some GM spray but i think carb cleaner will work well as well. Hooked it all back up, changed the fuel filter again and no more problems. Just be careful not to break any o-rings and to clean the fuel rails as well. I had gotten a bad tank of gas at a station that was recognized on the local news for selling bad gas.

Jamesbond2509

iTrader: (1)

Did you fix this problem? I have the exact same thing happening except they're new injectors.