Re: uh oh.... now whats wrong?
Could be one or all of what you suggested. Include with that coil, plugs, carb, sticky valve, broken valve spring the list goes on. <br /><br />The thing I noticed right away though is it backfired a little bit, then you parked it for 2 weeks. After this 2 weeks it started hard or ran bad during warm up, then steadily got worse. Things that go bad during sitting idle even fro a few weeks limit the search a little. <br /><br />The distributor could have a crack that allowed water and corrosion causing a crossfire between cylinders. Not a likely cause as I think you said it only pops under higher RPM's. Could be a bad plug or plugs giving week or intermittant spark. It would run rough at all speeds but be more noticable under load or high RPM's. It could be fuel running too lean when opened up, but at idle running through the idle circuit getting the right mixture. <br />If you want to sink a lot of money go ahead and change all componants until you find the problem. I would not recomend this though, would be cheaper to have a mechanic look at it. Inspect your parts and see what they look like. If you still have the old parts you said you changed, coil etc, put them back on and see what happens. <br />I may be all wet but I still lean towards a fuel/carb problem. <br />Try this, with the engine warmed up carefully close the choke off slowly. Under normal conditions when you close the choke about half way the engine should rev slightly, then start to sputter just a little. Fully closed it should sputter flood miss and shake then die. If the engine revs higher but keeps going, you are running way lean. If it dies instantly before you get the choke closed off it is running rich. Be very careful doing this though, a backfire through the carb could burn you bad. Stay back and keep a fire extinguisher handy!<br />Best of luck and keep posting about this.
