Have an '04 V8 with 50,000 on the ticker. It started running rough over the past few months. I've run a few different types of fuel, but nothing seems to smooth it out. It's a noteable stumble at idle when cold. If I listen to the tailpipe, I can definately hear a miss. Once in a while it will stutter on light acceleration.
The dealer swears up & down that nothing is wrong and "that's the way it's supposed to run". Idiots.
Any of you experienced the same? Think it's time for a set of plugs? I'm guessing these things have a coil-on-plug ignition... any way to check if the coils are dwelling correctly?
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