Check engine light only when running
I have a check engine light that comes on when I'm driving but no code is stored. i noticed it comes on when i am driving up hills, also when i try to accelerate when it is on the car will loose power and do this weird throttle motion like it wants to go but whatever is wrong will not let the car accelerate. The only thing i have done is changed the mass air flow sensor. The car has 65,000 miles on it
