Originally Posted by Loomer
If it idles ok and stable with the valve unplugged, that would indicate the mapping is suitable,
If so check the tps cal, and then strip the valve and inspect the spring tension under the piston. Make sure it's rebuilt properly. I see loads of valves badly built up causing idle problems.
I've had the valve out and stripped it, cleaned, oiled and rebuilt but made no difference :-( yes with or unplugged I managed to set the idle to 900rpm and it sat there idling happy. Perhaps it's worth trying another iscv in there. Would it do any harm to leave the iscv disconnected long term? Thanks again for all your help