engine loping

[mosleyspeed6]

Anyone know what would cause this. When I parked my ms6 last night it had about 1/4 of a tank of gas. When I started it this morning the tach was moving up and down between about 6 to 800 rpm constant. It jerks pretty hard at a constant rate when accelerating. If I rev the engine sitting still and out of gear it seems to go away until it drops under 1000 rpm. Is it possible a blown spark plug? It almost acts like it is down a cylinder.

 

[KTsuchiya]

Anyone know what would cause this. When I parked my ms6 last night it had about 1/4 of a tank of gas. When I started it this morning the tach was moving up and down between about 6 to 800 rpm constant. It jerks pretty hard at a constant rate when accelerating. If I rev the engine sitting still and out of gear it seems to go away until it drops under 1000 rpm. Is it possible a blown spark plug? It almost acts like it is down a cylinder.

This may happen sometime in rainy weather. My MS6 doesn't like it when i switch from DSC ON to DSC OFF. When wheel spin happens in the rain when I make turns with DSC OFF, the same problem you have happens and then engine light comes on. It actually just happened again the other day.