hi ..I have a Husqvarna YTH 20-42 that I'm replacing its damaged engine with a 21hp ( white ) engine the engine has 2 mechanism on the front where 2 cables are suppose to connect 1 cable ( I KNOW ) runs from the deck lever to the deck and the other from the lever that's on the left side of the steering wheel ( IF YOU'RE SITTING ON THE TRACTOR ) to the lower mechanism on front of the engine ( THINK ) WHICH LEAVE 1 MACHANISM THAT HAS NO CABLE ATTACHED TO IT AND WHICH I THINK IS THE TROTTLE-CHOKE ?? ANYWAY I HAD TO RUN A SEPARATE CABLE ( CHOKE CABLE ) TO IT IN ORDER TO GET THE ENGINE STARTED WHICH I'M ABLE TO DO.. BUT I MUST HOLD THE PETAL DOWN AND WHEN I EASE OFF ON IT THE ENGINE STARTS TO SHUT OFF AND ALSO WHEN I TRY TO ENGAGE THE DECK..NOT SURE WHAT I'M DOING WRONG..?? I APPREICATE ANY HELP ...JOHNNY I TRY TO DOWNLOAD SOME PICTURES BUT HAD TROUBLE