I've been trying to figure out why my car is been so sluggish even after APR Stage 1. It worked great for one day and then stopped! When it worked, the car would accelerate with ease and very little pressure on the throttle. Also the throttle response was quick and precise. Now in order to achieve the same results, I have to go pedal to metal. I did some research and found some help, It said to disconnect the sensor and and see if it makes a difference when you drive. I did and of course it made no difference and no lights came on. Can someone please help? could it be that I have a bad sensor? or perhaps something else in the works which I'm unaware of? Thanks in advance.