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Help with engine problems

SbJunkie

NAXJA Forum User
Location
cali
i have a 91 xj with a 4.0l and its been sitting for about two months now. i went to go and start it today and a loud knockin noise started coming from the enigne. it seems to be the loudest at idle and quites down as the revs get higher, and then completely goes away when the throttle is released........ any idea's as of what this might be?
 
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