Join Date: Jun 2019
Location: Little Egg Harbor, NJ
Drives: Kia Optima 2004
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2004 Optima cylinder 4 misfire jerking/poor acceleration
My car is a 2004 kia optima 4 cyl. The car only has about 18,500 miles on it. it shot the P0304 code awhile back but has had no codes since and currently has no codes but is still having the problem. All the symptoms it is having now is after the car warms up it has very poor acceleration and struggles. It then jerks trying to go past 35-40 mph and anytime going up hill. It will then start to over heat if going up hill over a bridge for instance and will not go past 30mph. If i drive the car cold right after starting it seems to drive a little better, but when it warms up and starts misfiring or jerking and having horrible acceleration it sounds like the exhaust or engine is much louder..
So far i have replaced all 4 spark plugs and the one ignition coil pack that goes to the 3rd and 4th cylinder (the one furthest from the serpentine belt). i ordered new spark plug wires in the mail and should be getting them by this friday. The guy i bought the car from said it needed a new camshaft sensor so i have ordered a new one too and am waiting to get it in the mail as well.
The first day i bought the car it was driving much better but has seem to have gotten worse since then. I am really tight on money and cant afford to take it to a shop for an expensive fix right now. Does anyone know what else it could be causing this?
Any help is very much appreciated, thanks