car drives normal but when i put my foot down in top gear to say over take. it pull then about three to four thousend revs it joalts. it is abit like towing someone and setting off a bit fast. no lights on dash ie check engine and no problem ticking over anyone ave any idears?. p/s runing dump valve and induction kit

 

Is it like you have turned the key off for a split second ?
If it is it may be that you're suffering fuel cut due to overboost.
Boro wrote a good thread about overboost here
Probably would help if you gave details of the model too.

Steve

 

CAR IS 1997 P REG CATALUNA WITH 68K ON CLOCK 2LT TURBO. JUST HAD MAJOR SERVICE TOO ABOUT 1000 MILES AGO

 

Turn your Caps Lock off. Tends to get on peoples' ****.

Overboost is often caused by an overfill of engine oil finding its way into the boost control solenoid, so this would fit in with your having the car serviced recently.

You could probably sort this out yourself by cleaning the boost solenoid - just do a quick search on here for instructions. If you got the car serviced at a main dealer though, it might be worth taking it back there and doing a bit of a bitch 'n' moan, as they may sort it out for you.