My 2002 Pontiac Sunfire 2200 mfi, automatic, has a really hard shift when the "trac off" comes on. The car stalls on take off. Next time I drive everything is normal. There is no check engine light or error codes set in the computer. Mechanic and dealer want to throw new sensors on it. But I want it fixed, It wont fail for them but today it left me stopped in front of a cop trying to clear an accident scene.
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intermittent problems are some of the most difficult to find, Your choices are limited, either allow parts replacing which is obviously costly, or have a shop that you trust keep the car and allow their top D&D mechanic to drive the car for several days to find the problem, or purchase a data recorder like the Launch C Recorder II and then pay for the remote diagnostics.
If you want to see what the C Recorder II looks like and its capabilities follow the link;
http://straighttalkautomotive.com/crecorder.html