1996 chevy 3/4 ton suburban 186,000 miles. Needs work but the main thing is the catalytic converter is plugging up and makes it run rough. Needs to be cut out and straight piped and it will run alot better. I've beat on them and taken it out on the highway to blow them out and it ran better that's how I know it's the converters. Other than that just little things need fixed.