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The limp mode everyone is referring to is most likely one of two things.
1) a vacuum leak, check the two lines directly behind the oil filter housing. Over time from heat they get brittle and leak. I had this issue at around 45K miles. There have been posts discussing this before.
2) check your spark plugs. If you advance your timing to much and richen your air to fuel ratio, you will miss fire if your plugs are old. I again discovered this at around 45K miles. As with running any tune, you will eat up spark plugs faster than normal. I had a supercharged e30 M3 and it ran rich and went trough spark plugs rather quickly.
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