That's how they run (the older ones) with out a load. Run an electric tool on it and it should run normal.

I worked on those/ sold those for years. They are a bit grumpy, but they are strong...

"Does this part need to be in there?"

1996 Dodge 1500 single cab / short bed, 5.9 4x4; 2" lift (springs not blocks), C.A.I and more mods to come.