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2002 Pontiac Grand Prix GT 2dr Coupe

2002 Pontiac Grand Prix
Trim Info:
Front Wheel Drive, 2 Door Coupe, Mid-Size
19 mpg city / 29 mpg hwy
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March 24, 2013, 8:28 pm

Annie L

Question: What would cause car to shake violently?

When I first start the car, it idles fine and does not shake, but as soon as I put it into gear and accelerate at all, it begins shaking violently. I have only driven it around the block at speeds of about 10-15 mph since it started doing this, so I cannot say whether it does the same at higher speeds. After I stop the car when it has been shaking, it shakes while idling, unlike when it is first started. Suggestions I have heard so far is a misfiring cylinder, bad spark plugs, and loose hoses. The car has very high mileage, around 250,000. The radiator hose has also been leaking fluid. Within the past year the starter has been replaced and also the power steering hose.

Any help would be greatly appreciated.

March 27, 2013, 12:02 am

Richard W
Expert Mechanic

Yes I would start with a tune up. Also you need to fix the coolant leak. If the motor over heats you could hurt the engine.

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March 27, 2013, 12:51 am

Annie L

I took it to a mechanic on Monday, and he confirmed that a cylinder was misfiring and that the spark plugs and wires needed to be replaced. He also said the were a couple other things that needed to be tuned up, and all in all it wod have cost me almost $600 to do all of the work he recommended. He also charged me $100 from the start just to diagnose the problem(s). I declined to have it worked on because I know that $600 is way too much to just have the spark plugs and wires replaced, which is all I want done at the moment. My boss is taking the car to his mechanic tomorrow to have a second opinion done and have it worked on.

Also, after I declined the work, the mechanic said "If money is the issue, I can come by your house and do it for you for $180 after I get off here tonight." How completely shady is that?

How much should I realistically pay to have the wires and spark plugs replaced only?

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