Quote:


it takes about 5-10 secs to nose over at 1/2 to 3/4 throttle.



If it is a jetting issue, test this way:
drive the vehicle, and as soon as the nose-over starts, back off the throttle just a bit(not much)and if the engine picks up again, jetting
richer is a must. If the engine does not pick up, then the problem is
something else such as fuel flow or pressure, David.