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Hesitates,misfires, but only when engine has a load on.smooth otherwise

(1990 Ford F-250)
in Bonney Lake, WA on March 13, 2015
engine runs just fine, until I put a load on. Then it starts bucking n missing until about 2000 rpm
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Popular Answer
on March 14, 2015
check tune up spark plugs air filter wires fuel filter any fuel modules fuel pressure might be carbon buildup in the motor the check engine light on is there any codes
on February 28, 2016
If it is a diesel engine consider putting a new fuel filter in.
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