1993 Chevy Lumina Car shakes after travelling about 20 mile

1993 CHEVROLET LUMINA
150,000 MILES • 6 CYL • 2WD • AUTOMATIC
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ROSSDF
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My car starts shaking after about 20 miles. It seems to lose a little power as well. My mechanic says that it might need new plugs and cables or transmission work, but I shouldn't work on the transmission until it gets really bad. I know you can't see the car, but I recently got transferred to an office about 45 miles away and I depend on the car to get me there. I would appreciate it if you could tell me what you think. Thank you.
Jul 11, 2010 at 7:36 PM
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JALOPYPAPA
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I think I'd start with the plugs and wires if they haven't been changed recently, and if that didn't help, have some more diagnosis. It sounds like maybe a misfire, which wouldn't have anything to do with the transmission.
Jul 12, 2010 at 3:37 PM