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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.
 

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Check the two pipes to the idle control valve,one comes off under the throttle body before the butterfly.the other to the side of the body after the butterfly,both these pipes are attached to brass ferules that are shoved into the ally housing and they can work loose,both on mine have recently done this.If these are OK,take the valve off,in adition to the two pipes mentioned there is a plug to remove.give the valve a good dose of carb cleaner,then apply WD40.
Good luck
 
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