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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