I've got a 2003 Chrysler 300m Special with 97k miles. I have taken it to various mechanics and have paid over $600 in repairs this past month, and the same problem still occurs. On idle, the car shakes as if the engine is misfiring. I have replaced the spark plugs with Bosch Platinum's, new o2 sensor, the computer has been reprogrammed, there was oil in the plug reservoirs so I took it to the dealership and they replaced some gaskets and seals. The car is still running like crap, honestly.
Also, on acceleration, its really boggy until I get up to highway speeds, then it runs fine. Another thing, driving around town I can hear a tick once in awhile as if the computer is resetting or something, I'm not really sure. I think I'm going to replace a coil pack or two because one of the mechanics said their computer was showing misfires because of them. Any help would be greatly appreciated.
Found my own post on this just today, the problem the whole time was that the mechanic put in a Bosch o2 sensor, which conflicted with the computer since it wasn't OEM. As a result, an OEM o2 sensor was put in the vehicle, and it runs great now. Hope this helps anyone having a similar problem.
When ever you change spark plugs you should also change the ignition coils and/or wires. If it isn't that you might need a fuel injecting cleaning or use better oil at oil changes.
Take your car to a chrysler dealer they know the car best I had same on my 99 300m
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