why does my '90 shake when my foot is on the brake when it is in drive???
- posted
15 years ago
shaking little 90
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- posted
15 years ago
It's idling too low, and/or it's misfiring. Try replacing the spark plug wires first.
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- posted
15 years ago
You probably have a vacuum leak on the power booster (poviding of course a 90 has such)
OzOne of the three twins
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- posted
15 years ago
Not knowing precisely what you mean by "shake", I'll provide yet another possibility: warped brake rotor(s).
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- posted
15 years ago
Turn the idle up about 50 rpm and/or clean the thottle body with a spray-type throttle body cleaner. Automatic transmission need to idle faster than the manual transmission cars for several reasons. Auto transmission miatas do seem touchier about a dirty throttle body. I would not worry much about the spark plugs unless they are actually fouling, but miatas are definitely hard on their spark plug wires, so that would be next on my list of to-do's.