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I have a 1997 monte carlo with a 3.1L engine. the transmission won't shift when it is cold but after the car warms up,it shifts ok. What might be wrong?
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Sounds like possibly more than on problem, crankshaft position sensor, or ignition module likely on starting prob which maybe affecting shifting due to hard code in ecm, or shift prob could be shift solenoid in valve body of transmission. Both parts readily available from local parts store
It dosn't sound like you have a major problem .I would take it to a transmission shop for service oil filters testing for codes its about 100 bucks .new transmissions are a lot more .
Sounds like a transmission modulator. Its on the back of transmission with the vacuum line running to it. Check to see if you have the vacuum undone or broke on intake or trans
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