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Sluggish start on a 1998 chevy Silverado

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      Okay so about two weeks ago my truck was having trouble starting , sounded sluggish like a dead battery so I went and got a battery, alternator and starter test all turned out good, then the next day the same thing, figured a bad cell in the battery so I replaced that then the same thing happened, so since my alternator was under warranty I got a new one and it started up fine that day and the next , then the next day same thing with the sluggish start so i figured something might be draining the battery so I checked all the fuses and did a parasitic draw test and the only fuse that was drawing power while off was my 50A lighting fuse under the hood, which was only drawing 0.03 so I doubt it could drain overnight, so just Incase I pulled it out, along with the fuse inside for my Courtesy lights, glove box and etc and left them out over night to see if that was the problem, so today when I went to start it , it was the same very sluggish turning over, took about 4 times turning slow and finally cranked, I let it run for about 20 mins and ran fine, but it’s like once it sits over night, it drains the battery or something ? Do any of y’all have suggestions ?

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