[QUOTE= But the weird part is that after it dies and I restart it, it runs just fine. I can go up any hill, push the speed, etc.
[/QUOTE]
This is the interesting part which requires further diagnosis. It would appear that the engine actually stalls and will not continue to run, even badly. Please confirm. If so would appear that something intermittent fails and then resets.
Worse when the engine is cold --- i.e. right from start up or shortly afterwards? Does it idle OK at start up? Ditto when hot?
Think about everything and come back with all the clues you can.
Let us hope we can come up with something more definite. Trevor.
