hey
i recently had my 12A rebuild and i got it running and everything....but I had to take it out again cause i blew my pilot bearing..and when i droped in the engine and started it up and it sounded a bit funny...so i took it for a spin and the thing barly had any power... i noticed that when i disconnected the vacuum hose from the studder control valve it ran fine until you drove it a bit and then it began to studder....any help would be greatly appreaciated...

thanks in advance

 

if there is no vacume leak then you need to look at the vacume diagram on the hood, also check the carb