I got used jato with a 3.3 it cant get it idle the only way it will idle is to adjust the throttle rod.so.it opens the carb a little bit but then it does when i hit the brakes the clutch spring looks good and tight i have tried adjuat lsn and hsn and idle.screw nothing seems to work and put 2 newer carbs on it tried going back to.factory setting then adjuat but it dont really help any thoughts