My older 89 trx350d idles and accelorates fine but when trying to hold a steady speed it acts like a 2 cycle and
sputters. I havent changed any adjustments, but have cleaned the carb out twice without any help. Any sugguestions on what to look at next would be a big help.

The engine was rebuilt less than a year ago so its not a compression problem, also noticed it idles alot higher
than it should, even with the adjustment screw set properly, I checked the choke, it works properly also.