a machanic had a quick look at it today, took the pipe off the turbo and turned the cog inside or whatever you would like to call it, he said when he tried to turn it but it was stiff but then he managed released with a little wiggle. for some reason i have alot more of a power boost than even before, but does have some flat spots now, so im thinking perhaps it is still the egr or air flow sensor????? im really new to all this turbo malarky lmao so please be patient. anywho im thinking of taking the egr off tomorrow and cleaning it. thanks for your help and if you or anybody alse can help any further it would be greatly appreciated.