well basically, ive been getting this code for a fourth time in a week after i clear it. havent ha a chance to really sit and look through my engine. however today i was checking my sparkplugs bc when i bought it used i noticed oil was in there. anyways when i checjed that there was no oil. so i continued my sear until i finally noticed the obvious, my z tube was for some reason not in the throtle body sleeve. i had ben experiencing a boggy acceleration and now that i fixed it it feels better. my idles arent as rough as they were. well my question is, can the ecu throw a code for that? ( code P0021 intake valve timing control bank 2). thanks. oh and i was thinkin that i might have disattache it when lookin through engine but i ddnt get tothe drivers side spark plugs so i dont think so. hahahaha