code p0304 ford f150
cleaned and re oiled my k n air filter. now it runs rough and engine light on. code says p0304. which is saying cylinder 4. i cleaned my map sensor and bought new air filter just in case too much oil from air filter, but same thing question is should i buy a new $100 map sensor and see if works. or should i take it in to have someone take out #4 plug and look at it.
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