Sparkyrob

I have a 92 f150 with 4.9 and a4od it runs fine till it warms up then it slips out of
gear and then starts to run rough. If I let up off the accelerator it tries to die if I give it gas it spits and sputters. If I hold gas pedal at a constant it will run and pull. I have changed the throttle position sensor and that didn't help If I let it cool for 15-20 minutes it runs fine but when it gets warm it does it again. I know it's got to be a sensor but no clue to which one. Any suggestions. Thanks