"I have a 1990 Marine power Ch
"I have a 1990 Marine power Chevy 350 which ran good the last two seasons. This Spring, I swapped out the points for electronic ignition and put in new plugs properly gapped and new wires. It ran great in the yard. In the water it backfires badly (sound echos from the exhaust, not the carb) under load and does not go above about 2400 rpm. At low speed it runs smooth. In neutral I can rev it high with an occasional backfire. After reading all the posts here, I will first swap out the fuel filters-- tank was stored full of E10 with stabalizer-- but I am suspicious that this is electrical. I doubt if it is an exhaust problem. I did not change the coil. I will double check the firing order and the tach wire. I can always swap the old points back in. I did not have a chance to check the timing so that will be next on my list. Any suggestions?
Thanks,
Jim"
"I have a 1990 Marine power Chevy 350 which ran good the last two seasons. This Spring, I swapped out the points for electronic ignition and put in new plugs properly gapped and new wires. It ran great in the yard. In the water it backfires badly (sound echos from the exhaust, not the carb) under load and does not go above about 2400 rpm. At low speed it runs smooth. In neutral I can rev it high with an occasional backfire. After reading all the posts here, I will first swap out the fuel filters-- tank was stored full of E10 with stabalizer-- but I am suspicious that this is electrical. I doubt if it is an exhaust problem. I did not change the coil. I will double check the firing order and the tach wire. I can always swap the old points back in. I did not have a chance to check the timing so that will be next on my list. Any suggestions?
Thanks,
Jim"