You're about to experience a lot more problems, including a very strong possibility of a bunch of valves seizing up in their guides which bends pushrods, breaks rocker arms, and bends valves if the pistons hit them. Never, ever, wake up an engine that's been sitting a long time without a thorough cleaning or replacement of the gas tank. I'd be reluctant to even attempt to start the engine again before checking all the valves for free movement. The gummy residue in stale gasoline has a nasty habit of depositing itself on valve stems, and then the first warmup and cool down of the engine turns it into some very effective glue. If it needs a valve job, there's no better time than now to pull the cylinder head and get that mess out of the guides! My favorite gas tank cleaning method is to strap the tank to a rear wheel of my tractor with ratchet straps, add a shovel or two of fine pea gravel, and bush hog a couple of acres of my farm. You could also tie the tank down in the bed of a pickup truck, half fill it with water and strong detergent, add some gravel, and drive around for a week or so. The trick is to use some sort of abrasive and/or soap and water to dislodge the crud inside of the tank. It's also a good way to locate the pinhole leaks that the crud has been plugging up. Good luck!
Jerry
