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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
What would cause my car to start hard when warmed up???? The only way to get it started is to push the gas pedal down all the way.. I replaced wires,plugs,tps,and preasure regulator...i have a 89 mustang 5.0.
Sounds like you may have some sort of fuel delivery problem, maybe perculation or the pump is becoming inefficient after it runs. You swapped regulators but did you look at anything before the regulator? Fuel filter can be a culprit that is overlooked by most. Put a gauge on it and see what the pressure is doing when cold as well as when warmed up.