I have a ’98 Cavalier Z24 with the 2.4L. I recently had the Mantapart competition big bore throttle body installed on my car (1780 C). I can really feel the performance increase from this modification. However, the car now has a very rough idle. I set the idle RPM’s to the lowest setting, but there is still a rough idle and the engine light is on. The idle RPM’s are still too high for this product at idle. I was wondering if there was any way to fix this problem to lower the RPM's at idle. If not I'm going to have to unfortunately remove the product from my car. The engine light code is: P 0507 Idle Control System. Thanks for your help!



-Marty