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Originally Posted by gw84
*Update* ('99 LTZ 3.8L) Drove the LTZ for over an hour yesterday. The shaking/jerking is back. I was driving home doing about 55mph. What should I do? Should I start cheap (plugs, wires, etc)? Also, is there anything that I should clean (egr or something)?
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Typical ignition misfire symptoms, based on mileage if you are due for plugs and wires do it, but stay with oe AC plats, and someone's premium wires, also Delco. There are other conditions that can cause this but basic maintenance comes first, any cel?