1997 Jeep Laredo no shift

1997 JEEP GRAND CHEROKEE LAREDO
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ONTYPOTOI
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Transmission problem
1997 Jeep Laredo 6 cyl Four Wheel Drive Automatic

bought a reprogramed ecm from Computer Exchange Florida to replaced the malfunction one. (air con not working and transmission do not shift to the appropriate gear while driving). It worked for 2 weeks (shifting) and bad again. The air con is still working ok.
Do you think the replacement unit is malfunction?
thank you
Aug 8, 2010 at 1:48 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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