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P0300 Code help needed

J

JBMech

New member
I am trying to fix my friends mothers 08 GP with the series 3 3.8L. Getting a P0300 General misfire code. Checked plugs and wires, even to the point of disconnecting plug wires one at a time and the engine runs the same. Definitely missing at idle, smooths out at higher revs, definitely down on power and mileage, I believe it is running in "safe mode". Replaced all 6 injectors, since that seems to be a pretty common problem, I also read a TSB for that model year about a problem with the injectors getting plugged up. Car does run a bit smoother but still missing. Any help would be greatly appreciated. Thanks in advance!!
 


Get a live data scan tool on it. See exactly what cylinders are misfiring and fix the issue from there.

Could be the spark plugs, could be a dying coil pack or the ignition control module under the coils.
 
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