i have a 1986 gn with a whopping 166,000 miles on it. i know, alot. however this car was my grandfathers and thats the reason i chose to try to restore her. i have been working on this car for the past three years and i still cannot get her to run properly. keep in mind the car is 100 percent stock, only has a shift kit installed. the car violently bucks and backfires under boost. it will only make it up to 8 lbs of boost before this starts to happen. let me tell you everything i have replaced so far... new spark plugs, wires, coil pack, module, fuel pressure regulator, lt1 maf sensor, maf translator, all new vacuum hoses and lines, new boost gauge, new alternator, battery, fuel pump, fuel pump hanger, hot wire kit, adjustable boost actuator, among numerous other exterior and interior items. from discussing this problem before, many people have told me many possible causes of this problem ranging from the cam sensor to the maf sensor to module and coil pack. i have tried the trick of unplugging the cam sensor when the car is running to see if it runs better and the car runs way worse after i unplug it so i dont think that could be the cause. and seeing how i replaced the other items i dont know where to go next with this. also, the fuel pump that i installed is ridiculously loud, you can hear it whinning from really far away, is this normal? im just trying everything i can to find whats wrong but i feel that i replaced close to every single part on this car to no avail. if anyone has any ideas it would be much appreciated. i will even give you my personal cell number if you would rather call me than type, just PM me. Thanks a lot guys, i really appreciate any input because like i said before, i am really close to just calling it quits and letting someone else deal with it. Thanks again