I own a 94 12valve ctd. I have a few mods such as 4" down pipe to 4" exhaust, 181 delivery valves,and a ground plate all the way forward.It had 3kgs but i just swapped out for 4kgs. Now when i start to take off its really rough up two around 12-1500 rpm.I have been told turn my low idle up. It idle's in the 750 -800 with a/c on in drive. When i first got it all my ctd buddys asked if it had a cam but it it still drove smooth,and ran really good.When i did the 4kgs i counted the clicks on the keeper nuts and put them back the same amount of clicks.