Took my Jeep here because my mechanic didn't have the new 'approved' smog test equipment for a carbureted engine. What a royal pain! These guys worked with me so much to get it to pass the test. They clearly explained the likely causes and I was able to get my Jeep to pass and it's running much better now. They are reliable, trustworthy and honest. If you need a new mechanic, I'd refer hem in a heartbeat.