Im still kind of new to this. I mostly work with Crown stand ups and can field strip one or diagnose just about anything with them. My problem is with our one sit down propane unit. I pulled it off line to replace the water pump. While it was apart I decided to do a basic tune up. Oil & filter, plugs, wires, O2 sensors, fuel filters(x2),PCV valve,and flush the radiator. After my tune up it runs worse! Very rough idle. The only success I have had is when I have reinstalled the spark plugs (had to make sure my gap was correct). Each time I have reinstalled she purrs like a kitten for about 5 seconds and then back to roughness. Oh, the exhaust is also spitting water if that is a clue to anyone.