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  1. C

    7.4 mph misfire when throttle up

    It’s finally working with new gas , new high pressure fuel pump, injector cleaner, plugs and cap. Thanks for the help!
  2. C

    7.4 mph misfire when throttle up

    Ok. I will check that
  3. C

    7.4 mph misfire when throttle up

    Todays test was installing a small outboard style tank with fresh gas. This was to eliminate the old gas in the fixed tank. This didn’t change anything. I am wondering if it could be dirty injectors
  4. C

    7.4 mph misfire when throttle up

    I’m starting to think it is bad gas. I will work on that next week. Thanks for all the advice everyone has given me
  5. C

    7.4 mph misfire when throttle up

    Can’t find serial number. It’s MPI. I was able to get it up on plane and it would sputter and than run strong than sputter than good again. It’s almost like a switch is turning on and off
  6. C

    7.4 mph misfire when throttle up

    This is what’s on my boat
  7. C

    7.4 mph misfire when throttle up

    RGMNA544H899
  8. C

    7.4 mph misfire when throttle up

    I will get the serial # tomorrow
  9. C

    7.4 mph misfire when throttle up

    Low pressure is 8lb and high 36-38, new fuel
  10. C

    7.4 mph misfire when throttle up

    My 1999 Regal 7.4 mph misfires under load above 1400 rpm. The fuel pressure is 38 at idle and 36 during throttle up. It has been sitting for a year. Idles fine under load and can putt around fine but starts misfire when hitting the throttle. Back fires if try full throttle. I have changed fuel...
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