Have you ever seen a Impala transmission drive normally till making a gas stop, upon driving away the transmission seemed to slip but then accelerated normally, and drove normally for about thirty seconds, then It acted like it shifted into neutral, it would not move in any gear until I turned the ignition off and back on again and then it went into gear but almost immediately went to neutral again? There are no check lights on, and now it will not go into gear every time I shut it off but when it does, it seems to pull real strong. fluids are good The transmission fluid does not appear to be burnt., It drove normally last night.