Ok, i'm going to see if the cylinder that's not firing is getting a spark first, then pull the valve cover. Anyway, the engine starts to choke sometimes with any more than partial throttle, but doesn't do it in lower gears. could this be a carb problem? it doesn't always do it. should i pull the valve cover and check for broken rockers/pushrods/valves or is there something else i should check first? sorry, it's hard to explain my problem. thanks guys.