Check the firing order. Might have wires crossed.
Well first you need to perform a compression test, this will tell you right up front of you have major engine trouble be it head gasket, camshaft, cylinder rings etc. First things first what do the spark plugs look like after it has benn running for a while??
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My husband did a compression test and this is what he got: valve numbers: 1-185 2-188 3-185 4-186. The sparkplugs are not wet and have no carbon.
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