Hello everyone. I have an 88 350 moto 4 that starts and idles great. If you try to rev the engine at idle it just dies. If you ease into the throttle it will rev up but it sputters. While riding it backfires through the carb and just does'nt have the power it should. It seems to do a little better if you choke it while riding but it still backfires. Any help or suggestions would be greatly appreciated.