I officially have not a clue what to do anymore. I replaced the spark plugs cleaned the injectors and still the engine is misfiring and in fact it got worst when the plugs were replaced yesterday.

The COPs all have slight cracks on them and someone suggested fuel pump problems. Anything else? My mechanic is at a lost so I guess I need a new ignition system because we just can't seem to spot the problem. Oh another thing also it has noticeably lost power and the gas fumes are very strong coming out of the tail pipe

Help anyone????/

 

What year, im guessing its a 5.4. Whats cylinder is it missing on? Is it the same cylinder constantly or does it jump around? If you have a cracked COP replace it.

 

Its a 1997 and yes 5.4L. I want to replace all the COPs but I'm really wondering if this by itself will solve the problem. Its been on-going for over a year now!

 

You're smelling raw gas because the plugs aren't igniting the fuel in the cylinders. Obviously, this causes power loss. Mine was doing this so I replaced all the COPs. Got them for $17.55 apiece BRAND NEW WITH COIL BOOTS off a guy on eBay. Runs like a dream now. Also make sure you use conductive grease on the both ends of the boots.

 

ive got an intermittent missfire lately.. found out trucks to rich. but we just erased the KAM so it should fix itself soon. also my porting intake manifold is going to be on soon and should fix it also.