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Engine idle rpms goes up and down on 1995 Ford Probe

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Engine rpm's goes up and down ,and the overdrive lamp flashes prereodicly. car won't continue to drive when this happens then rpm's goes down car goes agan.
(2) Answers
same problem. Make real sure your radiator fluid is totally full. I found that the intake manifold gasget had got so hot it curled up at the top corner tip. allowing air to get in unregulated. also check to see if your air intake tubing has NO leaks or cracks between your mass airflow unit and throttle body.