Dude, just try adjusting your linkage. They are held in by two shit bolts and could very likely loosen enough to fubar your linkage.
You should be able to row through the gears with the car off. Adjusting the linkage is a bit of trick unless you can gauge the proper degrees. How's your clutch pedal feel? If there was air in it, it would feel spongy and have some slack in it.
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