You certainly shouldn't need to recondition the cylinder head after such a short time. I would be checking for reasons the valves might be sticking. As the fuel injectors gave trouble shortly ...

For an engine to create propulsion, it first needs a few core ingredients. The process begins with fuel being pumped through the car's fuel lines and into the combustion chamber. This is where fuel ...

Random/multiple cylinder misfire is detected on this engine. The problem is intermitent and apears usualy when engine is warmed up. When it apears the engine starts vibrating and check engine light ...