I have been trying to figure out y this thing cuts out. Sometimes it runs good then all the sudden it will cut out but never dies while driving. If it's just idling and it acts up it dies. I've changed the coils, plugs,wires and mass flow air sensor. I heard it has a ignitor module if so will that go bad and where is it located? It's a 2000 SR5 4wd 3.4 auto tranny. I'm thinking a short somewhere and don't know where to start.