88 Mustang 5.0
 

My 88 fuel inj. 5.0 will barely turnover when the motor is up at normal operating temp.. Sometimes it won't turnover at all. I have to push start it. I put on a rebuilt starter, new solenoid, and battery. When the car is cold it turns over and starts fine. Drive it for awhile, then turn it off and try to start it. It barely cranks.

check your ground and power cables for a loose conection or short .
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when its warm and wont turn over run a jumper cable from the battery to the started if it turn over your short is between those two points .

this can be a HEAT SOAK issue...if the starter is close to headers it gets hot and doenst like to crank... if you have aftermarket headers you might wanna wrap the starter in some sort of insulation... or the headers next to it..
-as