Sounds like fuel is not getting to where it needs to go to run. Changed out the fuel pump and the fuel filter . when that didn't work Changed out the fuel pressure regulator. Can hear the fuel pump working. What else can be the problem?
Check your fuel rail on the intake. if you are not getting fuel there the blockage is in the lines, if you are getting fuel there then it is your injectors clogging up
SOURCE: 1991 Ford truck 150 300
CLEAN FUEL INJECTORS AND CHECK FOR INTAKE MANIFOLD LEAKS.PCV VALVE AND EGR VALVE COULD BE LEAKING STICKING OPEN.CHECK ALL VACUUM HOSES FOR VACUUM LEAKS.OLD VACUUM HOSES WHICH IS CRACKED OR BROKEN WILL CAUSE VACUUM LEAKS AND ROUGH IDLING.IF ALL IS GOOD DO A COMPRESSION TEST CHECK FOR LOW COMPRESSION.WORN VALVES WILL CAUSE ROUGH IDLING.
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where are the fuel lines?
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