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2007 LS2 manual 6 speed. Car ran fine last time out, about a month ago. Started it up, but would not go into gear while running. Clutch did seem harder to push. This problem happened while the car was sitting in the garage. Any ideas as to what is going on, master cylinder, slave cylinder, neutral safety switch, air in lines, etc.?
Will it go in gear when not running? Have you checked the clutch master cylinder for fluid? If it goes in gear when shutdown, what happens when you start it in gear?
It shifts fine when not running. It struggles to start when in gear, sometimes it won't, but when it does, it takes off, even with the clutch depressed.