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I have a320cd coupe 0454 70k miles problem is the emmission lite is on we have swopped the air flow mass sensor, when we did this the light stayed off for two miles then came back on coupled with that is the fact that when cold at low revs<2k there is just no throttle response, it spits a bit at around 1800 then acceleration explodes at 2k me n my mech are a bit stuck i dont wanna stick it at a bm agent as its brewster money open cheque book fault any tips out there guys pls?