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

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I will run through today's advrenture.............still have the problem:
1. Replaced the coil- no change.
2. Scoped out the ignition system - all looked normal even when the engine was doing it's shuddering thing.
3. Scoped each injector seperately and each had a norman trace.
4. Samplesd the exhaust with the analyser and it never showed any characteristics of an engine which is missing.
I was wrong when I told Denny- "that is a no to the airflow sensor" - I must have been blind! There is and when checking out the specs it says that it does not come into play until the intake air temp is above 10c (50f). Last Monday when I drove in the unusually cold 4c (35f) for 1 1/2 hrs the engine worked great. When the temp rose to about 11c (52f) the problem reappeared. Coincidence??
Today it is in the upper 70s and it is there mostly all the time although it sometimes dissapears for a few seconds when accelerating. For this reason one is on order for tomorrow as well as a coolant temp sensor just in case.

continues.............

The TPS was checked - ok with no flat spots. I will take the picture you requested and get back to you.