I replaced my fuel pump on my series III this afternoon and after I finished everything up I took her on a test drive which didn't exactly go as hoped. She started up up nice and I let her idle for a minute then I pulled out the drive. Everything went smoothly when I was in first gear then i shifted into 2nd and gave her some gas and she wouldn't really go. So I pushed the clutch in and tried to rev it up some but she still wouldn't get the rmps. I fleathered the gas a little and she finally got some rpms. I'm not really sure what's making her do this maybe some trash in the carb? Anybody had a problem like this? Any help would be much appreciated