I have a 1994 Pontiac Bonneville se. My speedometer, odometer and cruise quit after hit a pot hole pretty hard. now car also idles high, 1000rpm while in drive, 1300 while in park, and drops down to 1500rpms while going roughly 40mph and 55mph. I have replaced speed senor, instrument cluster and checked wiring and still not working. Was thinking ECM is next? Is there anything else I should try or just replace ECM.
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If I had a 1998 car with 218K miles on it and an unimportant thing like the trip meter didn't work I would put a piece of black tape over it and use a GPS as my trip meter.
as for the speedometer and the odometer reaplace your speed sensor but for the shifting problems i would replace the transmission fluid and put a quart of lucas stop slip transsmision fluid
if the odometer still works the problem is in the cluster if there both out then check the sensor near where the passenger side axle goes into the trans
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