My 1990 Craftsman 917.254450 just shut off after 45 minuets of mowing. No sputter at all, just like the key was turned off. Lets Trouble shoot the dead Briggs 18hp twin flat head 42A707 1238 00. Or I could say lets replace the coil pack on a Briggs 18hp twin flat head 42A707 1238 00.