Starting issues

Have off and on starting issues. Sometimes it just will not start. Relay clicks when key is turned but started does not crank. Come back out three hours or a day later and it starts no problem. Battery is fine. I think it is a loose connection somewhere, most likely on the starter, but I do not even know where the darn thing is and cannot find a schematic online.

Update: Started last night but will not start this morning. Tried tightening wires to the starter but did not help. Hear clicking from throttle body and it looks like the flap is not opening on start.