I have a 1990 F250, 8 cyl 302. The starter turns the engine over with no problem on cold start. The problem seems to be once the engine is warmed up and you shut it off. when I restart there seems to be a heavy draw and the engine turns over slowly and sometimes will not start without a boost.
The alternator and starter have been replaced and battery appears fine.
The ground cables and starter cable are as old as the truck. Could they cause this kind of problem?or maybe something else?
Any suggestions would be appreciated.