i have a 1990 mustang it will turn over but slowly and won start car.... i can push start the car and it starts and runs great.... i have done everything i can think of .... new battery, new 1G cable battey to silinoid, new silinoid, new wires from silinod to starter, new starter, new cap and roder, new spark plug wires , i had altinator and new starter tested along with battery all good... engine is rebuild i drove it about 1k miles then after work one day it wouldnt start.... i had 10-40 oil in it its winter so i changed that to 5-20 so im out of things to do anyone have any ideas??? im stumped...