My '93 Camry would not pass the smog check. Edwin suggested cleaning the intake manifold and fuel injectors. Gave me a 60% chance of success. Suggested this since it was the least expensive option. It worked! The work was reasonably priced, but the smog check was expensive. Overall though, I was glad to have the car repaired and the smog check done. Thank you, Edwin! He is a true American success story!