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Everything is completely stock accept the boost gauge

I have a boost gauge and it usually peaks at 9lbs and holds at 7lbs. Now it goes all the way up to 15-20lbs and once it gets to 10lbs or higher it bucks really bad. I might as well jump out of the windshield! I changed the spark plugs and 2 were blown. That didn't help. Any place I ask no one...