Hi people

I have a 93 RT Twin Turbo, and have an issue. It runs good most of the time, no hesitations, no miss-fire, but when you push full throttle from any speed the turbo gauge goes straight to the 14 mark, (probably over but that's as high as the gauge goes), and the car seems to stumble a bit and can hear a sound like the waste gate opening and closing fast.

Check engine light doesnt come on and goes back to normal as long as you keep the pressure under the max mark, but easily goes to the max if you put your foot into it.

Any suggestions???????