Won't stay running

[freebyrd24]

Well I uploaded some new tunes and am now having a problem. The truck will reluctantly start, but then after running for one second it shuts down. I had the truck running on Wednesday and idled and drove fine, now it just runs for 1 second. Any ideas on what the problem could be? I haven't changed anything except uploaded new tunes

[nagelandy55]

i would check your timing, maybe the belt jumped a tooth

[fordnut71]

id would reinstall the old tune you had in there 1st to see if the tune is the problem.

[freebyrd24]

I returned the ECU to stock, just to see if it would work, and the truck fired up and then idled as usual. So its most likely the tune. I'll have to get to the bottom of it