I was wondering if anyone can send me in the right direction I have an 1998 F150 4.6l 4x2 Ihave been getting a P0304 dtc code on an off for over a year now, it has gotten so bad I cant drive more than ten miles without throwing this code. I have changed all plugs and wire no change even swaped out wires one more time to make sure swap colil packs same thing, changed tps, per a mechanic that didnt work either, changed fuel filterno luck, cleaned MAF truck ran good for about a week under acceleration I could feel the engine wanting to misfire but it didnt throw a code, now its back to running like crap, another mechanic said it could possibly the ( speed sensor ) does this sound possible or should I swap one of the injectors with number 4 to see if it throws code to another cly on the same token while engine is running rough I can turn O/D off and it smooths out.
Any help would be greatly appreiated.

 

What kind of plugs did you put in it? From what I understand the Motorcrafts work the best in these motors. That and when you were going through everything (troubleshooting) did you check the spark for that cylinder? You've already covered a lot of bases, run some fuel injector cleaner through it.