When first started it runs fine, can rev engine and its responsive. Seems that once it warms up it doesn't want to run. You can keep it running if you play with the throttle. It will not idle. I believe it is a sensor but not positive where to start. Hooked it up to a scan tool and it gave me a Mass Air Flow low voltage, and a PIP circuit failure code. Tried a new MAF sensor with no luck. It has 40 psi fuel pressure when primed, about 33 when running. The catalytic converter is not plugged nor is the muffler. It has new plugs and wires put on by the previous owner. It is a 1.9L 4 cylinder Ford engine.
Have you check your coil? when coil get hot they will break done .i had a car that did the same thing . and it was the coil . check your fuel fulter ok . have a good day.
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fuel filter is fine. maybe a plugged injector. has spark on all 4.
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