Date registered: Jan 2007
Mentioned: 2 Post(s)
Quoted: 82 Post(s)
I think you need to narrow the possibilities.
Hook a pressure gauge into the rail at the CSV and see if the fuel pressure goes up when this happens.
When it runs rough, let it run for a moment, and pull the plugs to determine if it's happening on all cylinders or one or two or four.
If it's on one, it's probably an injector. Multiples of two, trigger points.
If all cylinders, then something is telling the brain to really increase the pulse width of the injectors. This could be the input from the temp sensors, the throttle switch, the MAP sensor, or the wiring, or the brain itself.
I'm no expert, but I would bet on a fuel pressure spike.
Falls Church VA