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87 f150 4.9L random misfire at low idle.

87 ford f150 4.9

Having a terrible time fixing this truck. Random low idle missfire. Dead spark from distributor to cyl 3. Only at low idle. Dies sometime when put from park to drive or park to reverse, or sitting in park. Runs great after it is warmed up.

Ive changed
Idle control valve
Map sensor
Spark plugs.
Plug wires
Coil
Computer
Distributor
Fuel pump and filter
Running out of things to change. Not a single thing has made a difference. Any help on this would help out
Not sure what would cause a spark misfire when all the other plugs fire while running.

Check the compression. How many miles on this engine?

Quote:

Originally Posted by Michael Ellis (Post 5223357)

87 ford f150 4.9

Having a terrible time fixing this truck. Random low idle missfire. Dead spark from distributor to cyl 3. Only at low idle.

Did it also do this before you changed the distributor?