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misfire can be caused by a few things. weak spark, low fuel pressure, to much fuel, vaccum leak. a simple check on this engine is to remove vaccum line from fuel pressure regulator, on fuel rail, driver side of engine. if you crank engine, and fuel leaks out vaccum port on regulator, its ruptured and causing rich fuel mixture. try that and let me know.
motor mounts can be changed without pulling the motor the load percent change that the other guy posted is normal and a vaccum leak would cause the engine idle to wander when in neutral. if you need info on how to change mounts let me know
posibly he has a vaccum leak and somesome saw the o2 rading or the fuel trims. can you hear hissing sounds from the engine area when it's running? on the back of the intake manifold there is a hose that gets soaked with oil and leaks. you may have more than one problem. the IAC valve which is on top of the throttle body may be deffective.