Car has 177 thousand miles. Check engine light came on put code reader on and it gave error P0304 Misfire Cylinder #4. We replaced spark plugs and wires. Took for test drive and car still misfiring and engine started smoking and a really bad smell emmitting into car but check engine light not on or throwing any codes. It is running worse since I replaced plugs and wires. We rechecked the gaps in plugs but still misfiring. I have recently had to add brake fluid 2 times because it was low. Which I have not had to do in the past. The vibration at idle has progressively gotten worse over time. The engine hasn’t died yet as of rough idle.
What makes this problem better or worse?
The rough running only noticable during idle and
How long has your 2001 Dodge Neon had this problem?
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Have you performed a base engine compression check?
And, make sure all wires are going to the proper places.
Pull spark plugs and see if they are oil fouled already also.
