i live in northern ohio and since its gotten cold my car is hit and miss when starting ive checked the starting system and it all checked out my batery is fine and if i jump it itll turn right over without really having a chance to chare anyone know what the problem is?

 

Check EVERY single ground wire...clean them

 

ive checked and cleaned all ground wires but the last time ive jumped my car after going to a doctors appointment which took roughly an hour my radiator fan came on as soon as i got the jumper cables hooked up. fan relay?