Ajay i don't know if this is relevent but if you beast has a carburetor mine was just fixed, it was a combination of the base plate between the manafold and carburetor being out of shape and taking in to much air, and the electronics on the carburetor controlling the solonoid was giving the carburetor the werong signals.
After that mouthfull its running like a dream hope it applies to you and helps even in the smallest way.
Gool luck.