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Purchased new GM marine engine from Michigan motors last year. From the first day it had an issue that was causing miss-firing at around 4300rpms. After checking everything, fuel, ignition modual I changed out the coil and it would then run up to WOT. The ignition system is the GM Delco HEI...
Just installed a New GM 5.7L Marine engine from Michigan Motorz in my Monterey 196BR. After it was installed it fired up with no issues but would only run up to about 3500 rpm before it started to backfire through the carburetor, Edelbrock 1409 marine model. The base timing is set at 8 deg as...
