Triumph TT600 stalls during deceleration

Under your air box on left side is kind of a round canister pretty small called stepper motor has 4 vacuum lines one from each carb annd 3/8 hose that runs up to air box usually 3/8 hose comes loose or falls off has to have good seal you can tell if its working look in from left side of bike through fairing when idling should see four vacuum lines pulsing if not check 3/8 hose and vacuum lines if all are intacked its probably the stepper motor they are two peice has teflon piston inside if bike ever went down oil goes int airbox down 3/8 hose into it and gumms it up run about $50