I HAVE A 125 U.S. MARINE FORCE ON AN 18.5' MONARK CENTER CONSOLE. WAS TOLD THAT IT IS A 1987 COMBO. THE MODEL# 1258F6A & SERIAL# 1253. IS THE YEAR GIVEN CORRECT? I HAVE CLEANED THE CARBS,REPLACED THE PLUGS ALONG WITH THE BOOTS AND CONNECTORS ON THE END OF THE PLUG WIRES. DOES NOT SEEM TO BE RUNNING AS SMOOTH AS IT SHOULD. WHEN AT AN IDLE, ARE CERTAIN PLUGS NOT FIRING? DO THEY START FIRING WHEN THE THROTLE IS ADVANCED? COULD SOMEONE TELL ME,WITH A TIMING LIGHT, WHICH MARKS TO ALIGN FOR PROPER TIMING?
