This issue has me pretty stumped on my dad's bu. 04 XTI with the indmar 350 and ~350 hours on it. The engine runs great when you rev it in neutral, but if it is under load it will randomly cut out for about a half second when accelerating then carry on as if nothing happened. It does it multiple times during heavy acceleration even makingĀ it difficult to pull a slalom skier up if you hit the throttle hard. So far I've change the plugs, wires, cap and rotor, fuel pump, cleaned the pump screen, an