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Imperial Beach, CA
If it's a knocking noise, it may be a bent push rod. If it's a taping noise it could be a dry lifter. If it's a lifter try putting a quart of transmission fluid in the crankcase, it will clean the lifters & doesn't hurt the engine. It is a good upper lubricant
If they have been turned twice, then they are to thin & need to be replaced. The thinner they get the quicker they warp.
could it be a weak coil. The copil is on cyl 4 but I think it serves cyl 2 also.