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What's the best thing to do when in drive , the car shakes like a dryer ?

(1999 Oldsmobile Alero)
in Arlington, TX on February 18, 2016
In neutral its just a little vibration , but when in drive it shakes pretty bad , thr motor mounts look ok amd intact , there is a hissing sound coming from underneath , could this be a small vacuum leak and that is the reason for shaking?
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on February 18, 2016
yes,it could very well be if you're hearing a hissing sound.try and find the leak,vacuum hose is cheap.
on February 19, 2016
It could be a vacuum leak, usually an easy fix if you can find the leak. Another possibility is an ignition misfire. If your plugs (or even your wires) are shot, it might idle rough, or even idle smoothly, but get rough when you put load on the engine by putting it in drive, and get worse when accelerating. Replacing plugs and wires would be the fix if that;s the problem.
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