Q: When I try to start it, it cranks slowly as in cranks like dead battery but then cranks just fine but won't start

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When I first bought this 97 Tahoe, it had issues with the battery staying charged or starting. So I bought a new battery and it didn't help. So next I bought a new starter and alternator both and replaced them. It then started and ran but it still had a hard time with slow starting. Now it's to where it will crank with the same hesitation but won't fire. I had fuel pressure tested it's good and I'm getting good spark. I'm thinking it may be crankshaft positioning sensor but not sure. Any help would be appreciated.

My car has 175000 miles.
My car has an automatic transmission.

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