I HAVE A BOAT WITH I/O MOTOR. NOT SURE THE YEAR, THIS IS WHAT I CAN FIND ON IT.
BZC
2.24.87
GM6269732
FIRING ORDER 165432
WHEN I START SOMETIME IT WILL BACK FIRE. AND NOW AFTER I CHANGED THE SPARK PLUG. WHEN REV IT UP IT WILL RUN OVER 6000 RPM. WHEN I PUT IT IN GEAR IT DOES NOT WANT TO GO OVER...
