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Dropped in a new (to my truck) engine and can't keep it running... please help

(1990 Ford Ranger)
in Berea, KY on July 14, 2017
I've got anot her 2.3 for my 86 ranger, sill the old school 4 plug setup... engine had been changed over to carborated, now switched back to efi, had points installed but is now electronic distributor... can get engine to run but have to hold throttle open to get it to do anything. Timing has been set correctly and has fire on all plugs, but still missing on one cylinder... has all new fuel system including lines all the way up to the rail, has new tps, mass airflow, coil, and entire distributor has been rebuilt, but still can't get it to run correctly... any suggestions?
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Popular Answer
on July 14, 2017
Find mis-firing cylinder > (pull plug wire to see if makes a difference) .. Check for vacuum leak at or near that cylinder - check for proper fuel delivery and compression also .. 4 cylinder engine with 1 cylinder misfiring ain't going to run very good to start with! .. Also check for proper idle control operation.
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