i just finished putting my head back together and when i went to start it up, it would crank over, but no start. I replaced my sparkplugs and i have fuel going into my fuel rail, i took a test light and made sure that i have power before the plug, and there is power in the plug but there is no spark coming from the coil. i replaced the spark plugs with the same that came out and before the headgasket went, it ran fine. has any one had this problem or is there any way to test my coils? i would prefer to not buy new coils but will if they are f*****, any help would much be appreciated. if u need to know any other info let me know.