tips on timing belt?? need help asap d15b7

so i noticed my timing is definitaly off by atleast a tooth or two, didnt make clanging but had one small little backfire. i took everything apart set the timing marks and tightened everything back up the way my instructions told me to. and it still is off?!?! im getting sick of taking the crankshaft pulley off a million times. it seems like everytime i tighten the tensioner and have everything tourqed back on its off again. i dont know what im doing wrong but it is driving me crazy! ![BangHead [smilie=BangHead.gif]](./images/smilies/BangHead.gif)
![BangHead [smilie=BangHead.gif]](./images/smilies/BangHead.gif)