Stabley garden tractor running on one cylinder

My father gave me a Stanley garden tractor with a 21hp Briggs V twin OHV engine, i think it is the Intek. I don't have the model number with me, i'm out of town at work. He says it's running on one cylinder, it definitely has a lot less power. I'm a newbie to small engines, but i do know there is some spark to both plugs, and the compression is 120 on one cylinder, 140 on the other. I have not determined which cylinder is not running. Can some of the experts here give me a list of things that could be the problem, and how to check them? Like could it be the coil, etc?
 
Pull one of the spark plug wires and see if it runs. If it is running you found the cylinder not fireing. you only have two wires.
 
Some of these engines har trouble with the valve
pushrods bending and not opening the valves which
caused a skip. Pull off one plug wire at a time
until it quits and that will find you the dead
cylinder. Check for spark also as some had one
coil to go bad and still run on the other cylinder.
 

I've tried to answer three times but can't seem to get the site to work for me. It was the left cylinder, i had fire to both sides, but the rocker arms on the left had got so loose one of the push rods had come loose. The other was bent, i staightened it out the best i could and tightened both back up. It runs pretty good now. Thanks for the help.
 

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