key on engine off throttle body should move. tuning can cause some hasel with the bcm being gone? different? scan the codes it should pop up right away if there is a range problem with the comunication between the pedal sensor and ecm. also there should be a "tps" range as well. the pcm commands the tb closed to seat then opens it to the park when "key on engine off" occurs. there are some TSB's about this also. battery voltage is Critical on them as well. i have had them lose comm during crank if the voltage goes below 11 volts while cranking.
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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