Overtime, residue from the exhaust gasses start to build up on the honeycomb shaped interior of the catalytic converter. Sometimes the residue gets so built up that it clogs up the catalytic converter. This causes restriction or sometimes full prevention of the exhaust gasses to pass through. This can cause your engine to run badly do to increased back pressure at the exhaust manifold.
Symptoms of this condition often include:
21622 North 7th Avenue, Phoenix, AZ 85027