I have a 1986 crusader 454 that runs like new. When i go to start it however, it gives a slow. 1 turn, like the battery is dead then will crank normally. I dont think it is the battery because after not neing run for a week or 2 it has to crank awhile to refill the float bowl and cranks fine for those two 10 second cranks. Its just that first turn that does it. Any ideas if that is a problem?