tommy321

hello chaps ,was wondering if you could help?
my check engine light comes on when i start the car,and it judders and holds back with little power untill fully warmed up.the light will then come on now and again for short periods of time,but the power and responsiveness gets better and hesitation will stop allthough the power is no way how it should be.
I took it to the subaru garage and the pluged it in and said there was no error codes and could not find a fault????? and could not explain or solve why i was getting these symptoms and the cheak engine light coming on.the car is a 99 uk turbo with ninja full system exhaust with fastflow cat in downpipe,otherwise standard.maf sensor was replaced 6 months ago,drove like fantastic for a week then slowly decline to where im at now.maf cheaked and was told it is ok.any ideas??? thanks ,when the subaru garage cant help ,who can??