1998 Vauxhall Vectra TURBO

HI, WHEN EXCLERATING ABOVE 3000 REVS THERES A SUDERN POP THAT SOUND LIKE A PIPE BEING BLOWN OFF AND MY ENGINE MANAGMENT LIGHT COMES ON, I ALSO LOSS ABOUT 80% POWER AND HAVE TO PULL OVER, LET IT COOL FOR 5 MINS THEN ITS OK TO DRIVE OFF BUT IT WILL CARRY ON DOING THE SAME THING. THE GARAGE SAID IT WAS A VACUM PROBLEM MAYBE WITH THE AIR MASS FLOW, IM NOT SURE AS IT TICS OVER FINE AT 1000 REVS AND DOESNT CUT OUT, IM CONVINCED ITS THE TURBO, I CANT AFFORD TO PUT IT BACK IN THE GARAGE SO IM IN DYER NEED OF SOME ASSITANCE. YOUR HELP WOULD BE GREATLY APPRICIATED, ITS A 2.0 TURBO DESIEL
THANKS [img:2e2962a4ab]http://www.2carpros.com/forum/automotive_pictures/443212_VECTRA_1.jpg[/img:2e2962a4ab]