Engine idle rpms goes up and down on 1995 Ford Probe

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.

Asked by for the 1995 Ford Probe
sounds like your idle air control valve is bad,
1 more answer
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.