help needed and advice please

[damo c]

hi everyone, im in need of some help and advise please, i have a 1993 b3 2.0 8v, it has a 2e engine, since i have had the car its had a running problem, rough idle, hesitation, and the revs drop really slowly, the engine feels really lazy, i 1st thought air leak so i replaced all vacuum pipes, no change, then cleaned throttle body and isv again no real change, then cleaned maf. and guess what no change. i have checked timing and co and all is ok, ive even took it to 2 gareges and spent out on 2 diags and no faults found, both garages couldnt find the problem, so i had to pay out for the diag work with no fix. im totally lost with it. please can some one advise me

many thanks

damo