hey 95 gt automatic wierd think happend to me today when i was leaving work i start up my car waited about a minute and put it in drive the rpms start jumping and the car stall ,so i restarted the car and put it in drive and the rpms jump up and down for few seconds and then the car run normal it only happend when i shifted from park to drive when i got home everythink work fine what is it what is going bad ?