Engine Mechanical problem
1988 Jeep Comanche 4 cyl Four Wheel Drive 12k miles

I have a 1988 jeep camanche truck The problem is that sometimes it doesn't want to start totally dead and then other times it does start no problem. Already replaced all wires. plugs, starter, altenator You can pop the clutch and it will start but like I said sometimes it will start no problem other times it will won't Can you please help me figure out what else it would be