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Ok I'm back here is what u need to do to figure this out 1st have u ever replaced the coil pack ?? Plugs and wires if so how many miles do u have on them get back to me with awnsers and we will get to the bottom of this issue thanx Chris
1988 ranger 2.9 runs great cold then after a few minutes when warmed up hesitates with intermittent black smoke from the tail pipe until i hit the the throttle then clears and will repeat this behavior...
If you have fuel in your oil, your piston rings are bad. Get a compression tester from your local auto parts store and do a compression test on each piston. If compression drops, then my theory is confirmed. The only repair is rebuilding the engine, or buying a new engine. Replacing rings is very intensive work. It's easier to simply purchase a crate motor.
If it seems to run better when it's first started (cold) and gets worse as it warms up. You can try disconnecting the coolant temp sensor and jumper the terminals in the connector (wire side) with a paper clip. The coolant temp sensor is either in the intake manifold or the thermostat housing and has a 2 wire connector. Jumping the connector will make the computer think that the engine is hot (warmed up) and will not richen the system. If doing this helps then replace the coolant temp sensor. Hope this is helpful.
its your fule filter theres 2 of them i the 86 ford ranger you need to change them the location of the fule filters are on google just tipe in fule filter 1986 ford ranger location it should pop up there about 8 dollors a peace easy fix and your truck is like new also get a new battey if you havent k have a good day. oh i know this because i own one had the same problem