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Chevy/GMC Trucks \  Hearing a Knock

Hearing a Knock

Chevy/GMC Trucks Make Specific
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LowOrange88   +1y
OK, heres the latest with the damn thing. I started it up yesterday after sitting for about 2 weeks. It wouldnt start for shit, took a half hour to finally get it to pop off, and when it did, it let out a puff of blue smoke, and idled rough, then after a bit of reving it up, it smoothed out, but then i heard like a knock in the motor and the exhaust just sounds funny, kinda just putts. but it drives fine, just hard starting lately. Anyone got any suggestions, I think the timing is gonna be the first thing I check.
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