Hi all, got a '91 2.3 FPT 9000. The Check Engine light is illuninated when then engine is on, yet disapears when ignition only is on. Lights up once, as per normal check, then goes off!! This is coupled with an erratic idle when slowing down to a stop, at junctions etc. The car fires up OK and will idle all day when on the drive or at lights etc. There is no trouble restarting after a stall. Although the revs drop to below 500-ish and then climb and drop from there to about 1500, three or four times if it doesn't stall. Could this be a major thing or will a service/tune sort it out? Thanks in advance, Scott.