Is it safe to shift from d to d3 while cruising at high speed?

What will make a 2002 grand prix gtp jerk into gears and rpms bounce up and down at cruising speed?

ive already killed one transmission,i just got a low mileage used trans and replaced all shift solenoids,EPC solenoid and tcc solenoid before i had it installed.and im still getting ...show more
Answer:

I would try finding a stock PCM and seeing if that works.

SLAOKEC3LHBELKOKI63FS4HB4Y at Yahoo! Answers Visit the source

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