Search results

  1. F

    1993 Mercruiser 7.4 - Is my Problem Carb or Thunderbolt IV module

    Thanks for replies everyone. I will check out the shop that did my girlfriend's carb in her 70's mustang. Also I find a shop in Minneapolis that only rebuilds performance carbs.
  2. F

    1993 Mercruiser 7.4 - Is my Problem Carb or Thunderbolt IV module

    Another one I see some recommended is flying fish carburetors.
  3. F

    1993 Mercruiser 7.4 - Is my Problem Carb or Thunderbolt IV module

    Thanks for the replies. No my mechanic never did look at it because it was end of the season. The boat did sit over a season prior due to me rupturing achilles but it fired right off last spring. Prior to talking to mechanic I thought it was the carb as well, I have never had it rebuilt in 8...
  4. F

    1993 Mercruiser 7.4 - Is my Problem Carb or Thunderbolt IV module

    Hi, I had a problem all last summer that plagued me. I have a 1993 Formula 252 with 454 carb 7.4 Merc. It started and idled fine and ran at 4300 WOT at 55 mph just fine. Problem was in the cruising range of 3100 to 3800 rpm which just like clockwork it would consistently surge. By that I...
Top