[Halm]

Several months ago, my engine speed would hang at 2,000 rpm in a situation such as rev’ing the engine to 3000 rpm. In other words, it would settle back to 2,000 RPM not the noral 800 rpm idle. If I then held the break and used the clutch, I could easily bring the idle back down. I was also getting what I thought to be over run backfiring. To correct this, I replaced the Speed switch and everything was fine relative to engine speed and backfiring.

However, now I have difficulty modulating engine speed smoothly at approximately 2000 rpm (again!) after the engine has warmed up. For example, when driving around town in any gear at, or about 2K, and I let up on the gas and /or gently press it, the whole drive train seems to snap. This does not happen at any RPM above 2500 rpm, or when the engine is cold.

Is this a speed switch problem? Did I read somewhere that there are 2 different speed switches depending on the year and model? If so, could the wrong switch cause this behavior?