I recently changed the engine in my glanza S (4efe) I changed it to another 96 spec glanza S engine and ever since my car idles at 2000 rpm and won't drop and sometimes it drops to 1200 rpm and goes up to 2500rpm as if it has lifted cams!.. I cleaned iacv and changed the gasket so can't be that might just be f**ked Any idea what this could be