4r100 No second

[pullinpower350]

I have a 1999 f250, yesturday i was driving and pulling from a stop light and my truck stayed in first gear until i let off the throttle then it shifted to third. i put my scanner on it and took it for a test drive and it shows its shifting but the trans is not. Like i said its going from 1st the 3rd no 2nd. I let it sit yesturday about 3 hours and it would shift in second manually a few times then do nothing. I havent tried it today yet to see if its still doing it. Any sugguestions?

[pullinpower350]

more information. I took it for a ride tonight and it shifted as usual. I could do 2nd gear manual lockup. A few times when i came to stop signs it would remain in high gear until i applied power then it would drop down to 1st and be fine after that. Im at a loss as what can be wrong.