The last few days my truck has been idling ruff on a cold start (engine cold), enough to shake the hole truck, it goes away if i rev it up to 2000rpms and hold it tell the motor is warm then it will idle smoothly, i did put fuel from a passable dirty tank in it with some see foam added, not sure if its a fuel problem or just a timing issue, my uncle thinks its a fuel injector problem, any help appreciated thanks. Its a 1988 F150 with the 5.0L (302) 4 speed 4x4
ruff idle on 1990 Ford F-150
by americanmadebutnotchevrolet in Provo, UT on March 27, 2012
ANSWER by ace1100 on April 03, 2012
Change fuel filter
ANSWER by Rags946 on March 02, 2015
add fuel injector cleaner and upgrade to 93 octane ( you might have bought some gas that had water in it) try a bottle or two of Isopropyl alcohol
I cheked cap rotor , plugs, and new wires , not sure what to do
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