i am brand new to the forum and this is my first posting so bear with me. i have a 2001 f150 sport 4x4 with a 4.2 v6 in it. recently it started running really rough in the top end. it almost seems like its not getting enough fuel, i put a new fuel filter on it first then put bosch platinum plugs in it with accel wires and it still didnt help. it has a new EGR valve, new camshaft positioning sensor, and a new DPFE sensor. any suggestions are greatly appreciated....I NEED HELP PLEASE!!!

 

Welcome to the forum lots of good info here ..be sure to post some pictures

 

what codes are you getting??

 

no codes now after i changed the dpfe sensor and put a new camshaft positioning sensor in it. i then changed the egr valve but stilll runs terrible in the top end. some ppl have been telling me it could be a cat plugged up. i found another exhaust system with high flow cats but will it hurt to run it with no o2 sensors?

 

I dont believe the 4.2 has a CPS?

Anyways you might have a vacuum leak, or your IAC vavle is getting gummed up.