My car shakes all the time

2002 PONTIAC GRAND AM
170,000 MILES
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SONIGAL24
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When I am waiting at a stoplight the rpm almost drops to zero. I'm wondering why that is? When I am at a stoplight, the car shakes rough for about two seconds and then the shaking stops. I feel like its some sort of electrical problem because even when I use the window switches or turn on the air, it triggers that rough shaking for about two seconds. When I am stopped the car steadily shakes, the steering wheel and the whole dashboard, but when I put the car on neutral it's as silent as a library. But there are sometimes when I turn the air on or use my window switch, there is heavier shaking on top of the steady shakes. I ran codes on my car and I got a random cylinder misfire code but I'm not sure if that is what is causing all this random shaking and how to fix it.
May 24, 2012 at 1:01 AM
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SATURNTECH9
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What is the exact number?Also have you made sure your battery cables arw clean and tight?Also had your battery and alternator tested?
May 24, 2012 at 1:12 AM
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SONIGAL24
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I am not sure what the codes are I had it tested a while back in February. I haven't checked the cables but I got a new alternator and battery in January.
May 24, 2012 at 4:41 AM
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SATURNTECH9
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No matter how new everything is i would still check it even brand new cars right off the car hauler can be broken i have seen that many times.
May 24, 2012 at 4:51 AM
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SONIGAL24
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Okay will do, thanks for your help!
May 24, 2012 at 10:50 PM
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SATURNTECH9
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Your welcome keep me posted.
May 24, 2012 at 11:35 PM