i have a 1998 Snapper Z Rider Pro Cruiser with Kohler Commmand (Horizontal Xhaft) that idles and runs rougher (like a higher lift cam) . I also have A 1997 Snapper Z2205 KV with a Vertical Kohler Commmand engine with the same hp 22 and it runs smooth a idle. Whats the difference that I am...