Looking to have my 89 SC completely gone thru by a knowledgable SC mechanic. Does anyone know of someone who fits this description that is in or remotely near the Kansas City, MO area? Also...am getting an exhaust smell coming inside the car. Have had the exhaust checked and no leaks were found. But, I am hearing either an exhaust sound or a vacuum leak on the passenger side back by the firewall...basically right behind the throttle body area where the hose from the PCV valve runs back. I have also noticed some black residue on the firewall in that area. Any ideas??? Anyone???