[ashbrad]

I have a 96 chevy Silverado 4x4 5.7 motor and it does the same thing but it doesn't leave in first gear, it misfires and high rpms and doesn't go in overdrive. but if I drive a little while and turn it off, it's fine it acts like a normal truck would. then if my truck is off for more that a couple of hours it goes back to it acting up.