I just installed a Cold AIr intake into my 2001 hyundai Tibby, and since then, I have been noticing a decrease in fuel economy, and my "Check engine light" is always on. not to mention my RPMs are much lower, and constintly on the verge of stalling. every so often the car will have problems accelerating from a stop. did I install something incorectly, or is there a problem with the part?