P0507 Chevrolet -

Question

Did everything still idles high

Answer 1

Hi there,

If you have replaced everything and it still idles high, I suggest checking for an intake manifold or any vacuum leak. The fresh air coming in will cause the o2 sensors to see a lean fuel mix and the computer will continue to add fuel to try and richen the mixture. This could also be the result of a bad mass air flow sensor.