i have a 2002 4.7L 1500 it started misfiring today changed all plugs and three coil packs due to engine codes. truck is still runing bad with a new code PO172 fuel trim to rich bank #1 any tips on what i can do to solve this.

 

Your air/fuel is possibly off... Mass air flow sensor, fuel pressure problem, clogged air filter or over oiled K&N... just some possibilities for the rich issue.

 

thanks will look into that and see what happens.