Throttle stuck

[saltlife728]

Well Igot my V20 running but it seems like when I try to set the idel the throttle linkae on the carb dosent want to come back down all the way when you have the throttle up and then bring it back down it wants to set and run at 1500 rpm. I was just wondering if there was a way to fix this. I thought about putting a spring on it like you would have on a lawnmower. Any ideas wuld help.