Well My car isnt running to well so i decide to adjust the timing. I start the car let it warm up then i shut it off and take the spout connecter out. Then I put on the timing light start it up. The pully mark is reading b\w 20 and 30 on the scale. I try to lower it but my engine wants to stall. So then I adjusted by the way it ran listening for spark knock etc. What am i doing wrong? Any help would be appricated.