I repaced my catalytic converter on my car. It was clogged, and drove it longer than I should have. It has been replaced, but my car still will not pull up hills and idles rough at low RPMS. We have changed all of the spark plugs too. The idle controler on the engine is making a sputtering or popping sound too. could this need changed or someone suggested an EGR valve.
What could be causing the loss of power now?