transmission downshifting issues after rebuild- 95 cutlass
I had the tranny rebuilt in my 1995 cutlass supreme. ( It was slipping and making whining noise) I was able to drive it 2 days before it quite shifting down to 1st or 2nd. It starts off in 3rd gear and will go into overdrive. The tranny shop tells me they checked the obd for codes and that there were some but they cant get the computer to erase so they can drive and see what new codes come up. They put in a used comp ad now the car wont start. Are these computers re-programmable? or am I stuck with buying a new comp. Im already 2200 into this and a new gm computer is about 400. Help please.