[SOLVED for $0] -- 2010 misfire, stumbling, stuttering, coolant loss, head gasket, etc. symptoms

The head gasket has blown; the engine is next.

 

no code at all. I cleared them and they never came back since it no longer misfires. I do not need to smog untill June 2025

 

I like I said, no use replacing head gasket on an engine close to 300k miles when I can swap with JDM motor for $500 more. I figured this hack would give me a week or two, but four months later here we are.

 

I only ever cleaned the EGR and EGR cooler once and that was because I had EGR code and needed to clear it to smog back in June. In the past, I have cleaned just the throttle body, intake manifold and EGR pipe.