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about A week ago I purchased my Xterra. Supercharged with 3 codes at the time, knock sensor, o2sensor and a random misfire code. I swapped out the already relocated knock sensor to a new one, re grounded the oxygen sensor wire that had came undone at some point and replaced cap rotor and have ran a full tank of premium fuel in it. About 4 days later no stored or pending codes and still no boost. I have an aftermarket boost guage that reads about 2-3 psi on the first hard run of the day then I hat nothing, it will sit dead on 0 under hard acceleration. Any ideas?????
