since it has changed on you like that I would be inclined to think camshaft out of time or perhaps if the drive gear or driven gear are keyed that one or the other might be slipping on you causing the valves to not open correctly..i would look into the bores with the spark plugs out and watch the valves opening and closing on each cylinder to see if the timing on piston rising in relation to intake opening and closing and exhaust staying shut to tdc is remotely close..also check valve lash and make sure you don't have them to tight so they don't close all the way..someplace to start anyway hope this helps
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Today's Featured Article - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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