Hey guys hopefully you can help me out here, ill try to keep this short. My car has developed a strange cranking issue after it sits inactive overnight(10+ hours) The first startup is really rough, like car shaking and it takes a while for it to crank, when it gets going the engine turns like 3-5 times very slowly then jumps to average rpm and its good to go every time after. Replaced the starter with an oreily's rebuilt one recently if that might be any issue.

 

Do any cel come on in the few seconds it runs?

 

I'd do a compression test as well. A leaking head gasket could cause the same kind of issues.

You could pull the plugs and let it sit over night. Then in the morning try cranking the car with the plugs still out - any signs of coolant coming out of the holes?

 

This actually sounds like you got something draining the battery while it sits.

You might try looking on youtube for "eric the car guy parasitic draw test"