Originally Posted by
EMDSAPMGR
What is your idle speed when in gear? Possible it is too low. What are your compression numbers? Is this a straight 150, or is this a 150S model? Many engines in this year time frame have carbs that have plastic bowls. If yours has plastic bowls, they can be part of the problem. They warp at the mating surface with the upper carb body. It's not a matter of will they warp, but when. They can leak air, fuel and cause all sorts of running problems. Best to replace them with aluminum ones.