RE: ofna buggy
Does it stall when the brakes are applied??
If so, check the clutchbell and make sure it spins freely with the engine off, you can do this by rolling the car on the ground and watch the flywheel and see if it is turning, also feel for resistance when rolling it and make sure the brakes are not ingaged, it should not turn the engine at all, if it does youll need to pull the clutch assembly and inspect the shoes and springs, the bearings and make sure the clutch is shimmed properly.
Make sure your idle is not too high either.