So my iroc z is acting up today. My diagnosis of why is humidity. The car runs great as long as the car is in open loop or closed loop which ever it is but as long as the check engine light is on its the meanest 305 tpi its ever been. I have headers an intake and a stage 2 jet chip with no cat and a edelbrock muffler. my question is why the humidity has so much of an effect on the maf or map may make sense to which my book puts in the same code. as long as its not raining it runs fine but, it seems to me wet air is more dense, which is picked up by the sensors. is my chip flooding out the car or... can some one help. this has probably been answered a million times so im sorry, but im just getting into fuel injection mods and i need to learn some things.