I posted in the turbo section a couple of weeks ago about my boost creep problem. I think I might have figured out the cause. My lifters/valvetrain have been getting noisier as time goes on. I've also noticed that my transmission(so I thought)was having trouble upshifting at full throttle. I think, instead, that my valves are floating due to weak valve springs(100k mi.). And I theorize that my intake is getting pressurized. I've tried using 2 different boost guages and I'm seeing 20-25 lbs. at WOT with very little detonation and not much power. So does that sound reasonable?