Thread: 96 Ford F53 460cu in runs rough at operating temperature only.

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i'd check that thermostat closer. if its opens to soon it will make the computer run to rich.

The continuing story..................

Today we road tested with a fuel pressure tester hooked up to the rail and under load when the shudder/lack of power was happening the fuel presure stayed at 38-40lbs thus eliminating the new fuel pump, filter and the existing regulator.

I tried to cool things down with a gardon hose (wetting sensors one at a time to see if the problem would go away while in my driveway put although last week it did it easily when loading it down with the foot on the brake, now it seems to need highway driving and it took about 3 miles at 50 mph before it reeked its ugly little head again.

Tomorrow morning we are going to scope out the entire ignition system. Has anyone ever heard of a fuel injector breaking down when hot? The thing is that when driving it with the dog house off it seems to be more of a miss at times when it happens.............but still could be air fuel ratio.

I don't count sheep to go to sleep anymore - I count plugs and ejectors!!

Denny- that is a no to the airflow sensor.