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[Isphius]

sounds like a bad CPS or coil pack. lol. Did you try pulling codes yet? And dont put that STP crap in your car. Dont put any of those MPG or octane boosters or anything like that in either. And you can have a BHG and there is no external signs whatsoever, Unless you pretty much take the engine apart. And yes overheating can be caused by a BHG, But lots of other things too. What did your coolant look like when you took it out? Any rust, particles, smell, color, etc. It will smell pretty bad if its been exposed to oil or combustion gasses. I always tell people this, Your nose is the greatest tool. Once you learn how to use it that is.