Originally Posted by CalXR2

So my dad and I were cleaning the XR2's tappets out since they were so full of gunk they had gone solid. No play in them whatsoever. We've put them back in and torqued up the rocker arms, and when I fired the car back up it sounded really rough. My dad pulled out one of the spark plug leads and it didn't make any difference. One of the cylinders isn't firing at all. Anybody have any ideas as to what could be stopping the cylinder from firing?
Thanks.