my wifes 99 does this crap. if it's below like 50 degree out, it closes the valve, and will not reopen the valve for about a half hour. 2200rpm. 2nd gear. slow. no power. could this be the sensor, or is this an actuator problem. also, mebbe related, the boost peaks at only about 18.5psi. WOT, 10k lbs behind it. warmed up...
its supposed to do that to force the engine to warm up faster.if it bothers you,unplug it.max boost on a psd is 18-20 so your fine.