I changed the spark plugs and had 5 running. One I needeed a new wire. It was running clean with atiny amiunt if unburned gas. the one not firing. I went to the Azone new wires. came intslled alll new wires. I was running rich again. I checked cap and rotor. the cap had the center piece gone. So i was like this will fix the problem. no contact. nope it use to idle smoothy but rich. now it turns on and does right away.
im almost ready to sell it

 

have you checked your air filter?
replaced the ignition rotor?
and why do yu think it's running rich?
oh yeah , almost forgot replace the oxygen sensor if its original or has over 60k on it.