300zx shaking when just sitting there is under 1100 rmps

Q: my 90; 300zx shakes when its just sitting there under 1100 rmps. anyidea whats wrong? alose sharks when at low speeds and stopping.

A: Bad motor mount(s) would be my first guess. Do you have a problem with engine hesitation? Could also be a bad spark plug and/or wire.

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