Code P0304

CELESTE1996

MEMBER
2004 KIA OPTIMA
2.7L
V6
2WD
AUTOMATIC
168,000 MILES

Car shakes really bad when in drive and reverse. Rpm's are constantly jumping and is worse when the AC is turned on. (My AC is broken too at the moment). All the lights flicker a little. I have changed the spark plug in cylinder number four twice. Also, the check engine light randomly turns on and a day or two later turns off, and so on and so fourth. What can I do to fix my problem?

1 Reply

ASEMASTER6371

MECHANIC
52,797 POSTS

Good evening.

Some causes are:

1. Plug you did this already.
2. Coil or wires to the coil.
3. Vacuum leak.
4. Injector or wiring not allowing fuel into the cylinder.
5. Compression low from internal engine issue.

Roy