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Discussion Starter #1
I am getting an occasional knock/rattle at about 1500 rpm under slight throttle or during rpm drop. I can't duplicate noise in P or N, must be in gear. truck is strictly used for commuting, no towing or weight in bed. IP replace 1.5 years ago, good oil pressure, never runs hot, strict maintenance, and I use stanadyne additive. truck is a 96 gmc 1500, with 107k. Any help would be great.

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have you checked the fuel/water in fuel remember in cooler weather you need to add fuel additives
 

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Discussion Starter #4
Thanks for the help so far. I forgot to mention that I am also getting a dead spot/bog at 1500 rpm under slight acceleration at the same time as the knock noise.
 
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