I have been trying to fix this problem and am getting nowhere. It runs smooth at idle, but up the RPM is misses badly and backfires through the intake area, can't go above 3,000 rpm when driving but can wick the throttle at a stand still to get the rpm's up to 5,000. I have a new fuel pump, filter and have good pressure 44lbs. It really runs bad when you try to obtain boost, it just won't run unless your going down hill and ease the throttle. I have checked the injectors, compression, plugs, vacuum (no leaks) timing is good. I have no clue. Pulled the muffler and cat and no change. Ignition doesn't show any problems on the scope. It does however smell rich when I drive it down the road, but the consensus seems to be a lean condition? I can hear the turbo spool up when I accelerate and it does show boost but no power like it's running out of air or gas? Any help would be appreciated.