On trips of 3-4 hours, my 2001 Mustang
begins to feel like it is not getting fuel. The gas pedal is non-responsive and the car starts to shake very badly. There is plenty of fuel, oil and water. The "check Engine" light is always on because I have not replaced the catalytic converter. This has happened three times now on the road, but my mechanic cannot duplicate the problem to diagnosis it or fix it.