fast efi problem

I recently ran into some issues with my ez efi. it started out as rough idle and stalling at idle, I reset the tps and that seemed to cure it until last weekend when I went on a road trip to the track. it stalled 3 times on the way there at highway speeds. I made 8 passes on the track with no problems then started back home and it must have stalled 10 times on the highway and 5 times when sitting at lights.
I reset the tps again yesterday and thought I had er licked but after an hour cruise it stalled twice when going through town .
any ideas, ive been on the phone with fast and they don't have any sure answers.