Question about 1993 Chevrolet Lumina

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93 Lumina 6cyl 3.1 engine shaking @ overdrive gear

A week ago i was driving my 93 Lumina 6cyl 3.1 started to act up. I was comming off of an exit ramp from 65 mph. Let off the gass to slow down and coast up to the stop light. When i started off from the light, the car lacked power and developed a major vibration when i was driving at cruising speed. Now when i take off from a stop, it will go through the gears good until i get to 55. Once i get to 55 it drops into overdrive and the engine vibrates and the engine sounds like it's missing. I have been driving in drive instead of overdrive, but when i try to accelerate at cruising speed it vibrates, not as badly as when i am in overdrive. I can stop the vibration by pressing down the accelerator and dropping into a higher gear. It lacks power going up hills and trying to accelerate in the upper gears. The things i have replaced: Exhaust (cat, pipes, muffler), ignition coils, spark plugs, fuel filter, and fuel lines. I checked the EGR and it is fine. I have used fuel injector cleaner with no change. The code that came up about 3 months ago was O2 sensor (13), no other codes since or before. the code was a 1 time instance and it was -20 degrees F out.
It is not an intermittent thing and at stops it has stalled a few times now.
Any ideas of what it could be that's causing this.

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Check your camshaft and crankshaft sensors. When defective, it may cause stalls, misfires, loss of power. Also have check the engine for vacuum leaks. Hopefully this helps!!

Posted on Apr 14, 2010


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