I have been having problems with my engine. I can mow for about 30 minutes and all the sudden the engine looses power and puffs black smoke. I thought it was the carb, but it turns out the shop says the module is bad. What is the module? How much does it cost to repair? Any info will be greatly appreciated. 25hp horizontal Kohler Also, I have a friend with the exact same engine and problem. My engine has 141 hrs, his has 116 hrs.