Recently my mustang has had some issues. It would start right up if i let it sit over night or for a few hours, but if I go for a cruise or drive around for a while and shut it off. When I go to start it back up it will want to turn over but it won't for about 5 seconds. It finally just went out so I replaced the alternator and it started running again fine. But after I run it for a while it will have a very weak start. Any ideas on how to fix this or what is going wrong?
1990 5.0 hatchback
BBK 75mm throttle body
BBK headers
K&N intake
MSD ignition coil
Mangaflow exhaust with H pipe
1990 5.0 hatchback
BBK 75mm throttle body
BBK headers
K&N intake
MSD ignition coil
Mangaflow exhaust with H pipe