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Message: <blockquote data-quote="Alpha one" data-source="post: 362730" data-attributes="member: 31355">I took the intake manifold off and cylinder heads. The intake manifold gasket was bad. Water was going into the cylinder, but I don't think it reached the crankcase to mix with the oil.The head gaskets were perfect. No leaks, nothing. But I had the chance to clean the carbon deposits.New gaskets, no vacuum leaks, new ignition and good injectors, new spark plugs and wires.However, the random misfiring is better but continues, mostly number 4, sometimes 3 or other, sometimes none misfires for a while. If I accelerate the engine a little they don't misfire.I heard maybe I need to adjust the valves. There is no adjustment for it, except changing the pushrods length.How do you adjust the valves?</blockquote>