cmboyle

I have a 99 UK spec Turbo it cuts out between 2500 and 3000 RPM and engine check light comes on, if i hold throttle to the floor it bounces at 3200 rpm, if when moving i put full throttle its like hitting a brick wall. the problem is intermittent. I've just done a diagnosic check an it comes up code 45 which is Pressure Control Solenoid can any one tell me where to find it an if any one has any tips on what could be the problem please do post as this problem is driving me nuts