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To begin with, if you are revving a cold engine to 6000 RPM, you are asking for a blown engine. Most OBD vehicles are equipped with a rev limiter that will cut off fuel at 3000 to 4000 rpm to prevent you from over-revving your engine and blowing it up. If yours is revving to 6000 RPM cold, then the rev limiter, for some reason is not working while it is cold. I have no explaination for this. The best thing I can tell you is to stop revving your engine so high when it is cold unless you really want to see what an engine looks like after is has gone off like a grenade.
Hmmm.. well the galant has an ECU (engine control unit) that controls timing. Pulling a spark plug wire should have set a code for misfire and the computer may have tried to adjust, accomodate. However when you returned teh wire and ran the engine it should have recalibrated back. The cars do have a "limp" mode that when it detects issues that could be catastrophic it alters the idle, speed, etc of teh car to allow it to continue to run but with minimal damage. This is called "limp" mode because it allows you to slowly drive the car with decreased performance to a service location. If the car is running and driveable to short distances I suggest going to your local autoparts store and having them read the codes.. YOU write them down so you can diagnose, and then have them CLEAR all codes. If the car is stuck in limp mode this should reset the drive cycle and help. If clearing it doesnt help the ECU may be stuck or failing. From your initial comment about the car not turning off Im afraid it sounds like the ECU. The ECU controls the ignition to the engine, etc.
best way to find a vac leak is get a can of engine start, with the engine running spray it around the intake but not into it, be carful not to get any on the exhaust. If there is a leak the engine revs will increase due to the engine start being sucked in.