RE: Where is the crank trigger sensor?
Sounds like a fuel delivery problem. Under high load it is cutting fuel out, but under moderate driving it is fine. Correct? May want to check all of your fuel lines and filters for potential issues (bends, clogs, etc.). I'd also suggest running a dynamic fuel pressure test that can tell you if anything is subpar. You don't want to add any other go-fast-goodies until you have the basics cleared up.