claireface

Hello, I bought myself another corrado 2L 16v and when I bought it, it idled quite low between 500 and 800 we did the timing and it was about a tooth out. Now it revs too high about 1500 to 2000. Checked all the vaccum pipes and I bought a new idle control valve but still idles high :/ can't adjust the idle as its at the end of its adjuster any ideas?