Remove coil & take to local mower shop(s) and have them check in a coil tester same may be bad,you didn't say if coil orig or new replacement.If coil checks ok I would suspect either mega fire module bad or flywheel magnets weak,which is a common problem on many of the older briggs eng,you can try checking magnets by putting a flat screwdrive blade on magnets to see how strong they are,this is only a relative test & can be inaccurate,if coil checks ok after that either change mega fire unit or swap/replace flywheel.
Before you remove anything from eng,check that you have a good clean & tight eng ground connection for mega fire module,check connection with an ohmmeter between block & end of wire that connects to module.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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