When you have a miss that only affects one cylinder, you can mostly rule out things that will affect ALL cylinders. A coil will affect ALL cylinders. A Carburetor will affect ALL cylinders. A distributor problem will affect all cylinders as well. Those are all places NOT to look for the problem. I can almost give a 100% guarantee that you will NOT find the problem with an item that affects all cylinders. Having a distributor or coil affect only ON E cylinder and only when warm is a very unlikely possibility.
A warped manifold is one possibility. A bad wire or plug is another. A vacuum leak from an unused vacuum port is another possibility. Valve clearance is also a good possibility. If a valve is too tight, it can cause a loss of compression on one cylinder. Look for things that will only affect ONE cylinder.
Some suggestions are to do a compression test. Better if you test it while it is warm and acting up.
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Today's Featured Article - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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