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Yes, you got screwed. A head gasket is never the cause of an external oil leak. If something is leaking down the back of the engine, it is probably either one of the plugs in the back of the head or the valve cover gasket. The rear engine oil seal can also leak on the exhaust. Sometimes front engine oil seals leak and oil gets blown to the back of the engine by wind while driving. Start by cleaning the engine thorougly with degreaser. Once things are clean, finding the origin of the oil leak should be easier.
If the car starts and runs better when there is a vacuum leak, I would suggest cleaning the throttle body. If you haven't done this before, read the FAQ and/or buy the kit from IPD. This is job you can do yourself without the help of your scam-artist "mechanic". Be sure to clean out the vacuum ports with a small nail or drill bit. Clean out other vacuum ports on the intake manifold also. Also check the IAC (idle air control) valve for cleanliness and proper operation. Make sure the the TPS (throttle position) switch is adjusted correctly. It is a thin black box located on the back side of the throttle body. It should 'click' just as you open the throttle.
The old trailing arm bushing was beaten up so bad because the "mechanic" did not use the correct tool to replace it. Welding is never required when replacing suspension bushings.
You really need to find someone else to work on your car, or else do the work yourself. This bozo is a complete waste of your time and money. Good luck.
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Matt L. -- Cary, NC -- '89 740 sedan -- '91 740 wagon
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