hey Les, thanks for jumping in, so I'm assuming you mean injector bodies?? It only happens under that condition, but I am having another issue that might be a cause. I have a wiring issue with the rear plug on my injector harness on the last 2 or 3 wires, if I wiggle them is cuts out the injector (and that sets a code, and a hell of a vibration I might add). I'm in search of a new harness and haven't been able to find one on line that's just the part I need. Can't afford to do the whole under hood harness. Could a slightly bad connection be causing the return issue?