Ok Mechanic Types, here's an easy one. My '87 4Q with 145K just developed a new sound: kind of a 'pft pft pft" sound that sounds alot like an exhaust leak at idle and on the throttle. Exhaust is new from the cat back. It's also a little more difficult to start now. Exhaust manifold gasket? Sincerely, Duane San Diego, CA