Strange one after MOT - need some advice

Hi there - hope I can get some advice on an issue.

My car (Mk 1 - Campaign) has an issue.

About 3 weeks ago went in for MOT. Garage called to say it needed headlights adjusting and CO2 reading was off - running too rich. The CO2 thing I could understand. Had a 'specialist' service it last year and after a tune up they could not get the car to idle < 1200 rpm. Apart from that it drove great. Anyway, the MOT garage adjusted the mixture so it would pass.

Picked up car and the idle now seemed lower (which I guess makes sense). However, it would miss a little - at idle would suddently drop off - as if about to cut out.

Anyway, tonight it ran rough from start up (from cold) to the point where it cut out and would not start. Managed to get it going. Revs fine and drives OK - but when you slow and idle, very lumpy and you have to keep foot on throttle and keep revs over 1000.

So, I have two issues.

1. I need to reverse what MOT garage has done so it idles high but stops cutting out/running rough.

2. I need to know why it idles high when running sweet (I think this is probably the auxiliary air reg).

Any ideas. Car had had new pump/filler neck and had major service about 3000 miles ago.

Thanks

I'd play around with the fuelling first (recessed 3mm allen key next to the metering head) until it idles ok, then adjust the idle valve if needs be.

That should get it running ok - then I'd check the timing, and maybe re-visit the fuelling once you know that the timing is spot on.

Here's a useful way to check the AAV

HTH

Rich

Its worth checking the butterfly stop on the throttle valve with these kind of problems. From memory - loosen the locknut and wind the screw out, put a piece of paper in the gap and wind the screw in until the paper is just grabbed, remove the paper and wind the screw in a further half turn, tighten the locknut.