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The most common cause for this type of problem is ignition electrodes that are out of spec. Could also be a weak ignition transfomer/igniter.
Yes checking the electrodes is part of a typical tune up. Normally messing with an oil burner is not something I would recommend an average home owner tackle. I can tell you what needs to be done if you like but it's up to you to decide if you want to leave it to a pro or not.
You can't test it with a meter it 10,000 volts. We use a heavy screwdriver with a good plastic handle and bridge the 2 terminals holding the blade on 1 and the tip about 3/8" from the other then turn the burner back on. A good transformer arc will jump the gap.
To get to the terminals you release the tabs at the front of the transformer then swing it back on it's hinge. Another much lees likely culprit is a bad/dirty cad cell (electric eye) or a bad cell socket. You'll see it when you flip the trans former back open. It's attached to the underside of the transformer
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