Help

Travis R

New Member
Jun 15, 2014
5
0
1
Idaho
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
 
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Check the grounds are clean and tight
Is it spinning over normally and not slow? if so could be starter heat soak
When was the fuel filter changed last?
When did this start? Did you do any mods before this started?