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Sounds like a sticking throttle cable (or cruise) that might be getting pulled on when the motor torques up in gear. Disconnect both throttle cables and test it.
Don't forget to investigate the obvious.
To investigate fast idle valve: Have a friend put the car in drive and see if there is suction on the fast idle valve pipe (the largest tube that runs into the intake). Just put your thumb over it and see if it sucks on it - it shouldnt have any suction after the car's warmed up.
-Matt
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