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I have had the shudder/vibration problems with the SES light coming on and misfire codes. I can feel it from the engine down thru the trans. One of the chevy dealerships here in Nashville said this is a very common problem on the 350's. They said it is from buildup on the valves and injectors. They also told me there is not much you can do except keep cleaning them. The dealership recommended that I run automatic transmission fluid in the gas when the problem appears. I have had real good luck with that. The detergents in the transmission fluid will clean your engine. My problem with vibrations still show up on occasions, but once the transmission fluid has run thru the vibration will clear up and the SES will turn off.
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