Along with other comments- do a compression check on each cylinder. Look for wide variation in readings, or all readings being low for your engine, per tech manual. Fouled plugs indicate bad rings, broken rings, excessive wear, etc. If the engine is open, measure jugs for excessive diameter, out of round, beyond specs. Excessive clearance on main and rod bearings, camshaft, etc.Worn timing gears, chains. Slow starting when ignition parts are good.

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