please help, I own a 1997 f150 5.4 and I have a problem. ok when I drive at 55 and give it a little gas it misses chugs or something. Dose not only happen at 55 it is just a steady speed and then give it gas. Any Ideas? coil pack, plugs, injectors. I have know clue. The computer says it;s misfiring. Could a o2 censer do that? please help. tks scott
Do you have a computer fault code download option on that? ie: will give you some leads.
There could be a number of things. I gather that it just seems to miss anytime you accelerate?
Simple things first............
Could be blocked injectors. You can take it to a special place that will do a proper fuel injection clean - it can really wake up your car if thats the problem.
Blocked fuel filter?
Pull your spark plugs and look for one thats darker (oily) than the rest - this could indicate a dodgy plug. Just put a new set in.
Ignition leads can breakdown and earth out on the engine causing misfiring problems. You can pull one spark plug lead off the distributor at a time and see of the idle revs drop or one doesn't cause as big a drop as the others. This can indicate a dud lead or spark plug.
Inspect the inside of the distributor cap and rotor arm for a nice clean condition.
O2 sensors can cause the engine to operate poorly as the fuel injection is regulated by signals from this.