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Old 01-04-2005, 12:13 AM   #1
andie
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Join Date: Jan 2005
Location: fordyce, Nebraska
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car runs smooth, all of a sudden will shake

I have a 93 chevy lumina van. It runs good when it's cold. After it gets warmed up it will run ok till about 50/55 miles per hr. Then it will start jerking and shakes really bad. At first it seemed like it was missing but now it's more like a jerk. It does this intermitintly. but seems to be doing it more often and more severe. If I step on the gas it will come out of it till i slow down to that speed again. Also likes to do it at a slow speed like 35/40. The other night it did it just as i was stopping for a stop sign. When i went to go, it would kill. About the fifth try it took off. When I drive 65 and above it runs good.
We replaced the wires, spark plugs, cap, distributor, Put in an ignition sensor.and processor, and checked the distributor shaft. What is left to try? Could it be a coil or egr valve? Or what? We are stumped. Any help would be appreciated. Thanks, Andie
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Old 01-06-2005, 06:06 AM   #2
sukr9922
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Location: Dayton, Ohio
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Have you tried the Throttle Position Sensor? It went bad on my 96' Lumina sedan, and showed the same symptoms.
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