i had this with mine, check the intake hose for leaks/splits after the MAF. could be letting in too much air after the ECU has decided how much fuel to inject.
my garage also re sealed my plenum chamber as that was leaking air in
As far as I can remember on the GEMS Engine it is screwed into the plenum on the top of the engine on the side closest to the firewall....
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Item 16 in the attached parts image
I have had 3 P38's previously - 2x 4.6 HSE's and a 2.5 DSE....awesome machines....if my L322 hadn't have come along at the right price at the right time....I'd still have my DSE....love 'em to bits!Thanks mate I'll try and give it a go when I get a chance.
Scared I cause more bad than good.. gotta start somewhere though!
Thanks again for the info.. have you got a p38?