sir

I would not even run the car. If the misfire is a result of lack of spark, raw fuel will washout the cyl and score the hell out of it.

Your P1339 is probably a misprint on your behalf. P1399 is a temporary misfire code, very like P0300.

Pull the spark plug in #1 and read it's "story". If it's bone dry, and you can't smell gas on it, you're not getting fuel.

If it's wet, you're likely not getting spark. OR, perhaps the plug gap got whacked and is too small. A small gap is a sure fire way to get a misfire.

 

I'm no expert but I had this similiar problem. Except there was oil on the coilpack because of the rubber seal was torn and was causing oil to get in the coilpack. So it cause one of the coilpacks to go bad. So it basicly was running on 3 cylinders with check engine light flashing. It sounded like a harley with my loud exhaust. Very rough idle and accel up from 1k to 4k. It seemed to smooth out some at higher rpms but not as bad.

What you can do is pull the wires from the coilpack starting from the front to the back as the car is on. When you notice a difference in idle then you know one of them are bad but only pull it for like a half a second and if you notice a change then push it back in immediately. If it changes then you know that one isn't the bad one.

 

thought you guys would want to know how I fixed the probelm:


all 4 were like this and have been replaced with no problems since. can someone guess why the plugs got so black with 500 miles

 

Carbon deposits