Question about Plymouth Scamp
If this is a 4 banger, my friend had a this problem. This can sometimes be caused by the rubber motor mount has deteriorated. Also if the idle speed is low it will cause vibration. And for a final cure my car pool buddy's truck had a burnt valve, bummer.
Posted on May 15, 2014
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Posted on Jan 02, 2017
I would suspect a vacuum leak. At idle under high vacuum the air fuel mix is being leaned out until you have misfiring so bad the engine quits. The exhaust smells rich because even a lean mixture, if it doesn't light off, if full of unburned fuel. At road speeds, the vacuum is low so the engine doesn't care if there is a small leak somewhere. It is getting most of its air through the open throttle. Check all your vacuum lines but remember that even if every line is okay, it could still be leaking from an old cracked intake manifold gasket.
Posted on Jan 28, 2009
It's possibly the TPS (Throttle Position Sensor). The TPS controls the throttle in different conditions i.e. cold,warm, AC operation. It could be the TPS isn't idling fast enough when you operate the AC.
Posted on Jun 30, 2009
SOURCE: I have intermittent rough idle
Replace the spark plugs, spark plug wires, distributor cap, and rotor. Next, check the idle air control valve and replace it if found faulty. If it still shakes, have the timing checked out
Posted on Jul 01, 2010
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