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Could a bad iat sensor cause these problems? I'm running out of ideas.

Changed my fuel filter and burnt ect sensor and its still the same. Would it make a difference that my car was tuned about a 3000ft lower altitude?

Ok I checked the fuel pressure at the rail. When I key the ignition on it reads 50psi when I start the car it's hits 62psi and will stay steady at 62 at all RPMs. The car does not struggle to start...

What would cause high fuel pressure at the rails? Also my plugs look like the car is running lean

Ok I will start with changing out the filter and go from there. Should I check the fuel pressure at the rails? The car has a new racetronix pump with hot wire kit so hopefully I don't need a new...

Sorry if this is in the wrong section, but as the title states is it possible for the pcm to lose a tune? I had my car tuned last year and it ran awesome for the first day, but literally overnight...