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Welcome, I'm Chris (aka Moose) I prefer to work when others don't, I am here around lunch and after dinner till after midnight.
Its possible what your feeling is a misfire. As load, speed, elevation, temperature, air fuel ratio, and rpm change some scenarios result in the mixture hard for the spark plugs to fully ignite all the fuel, so you get a partial misfire where as one or more cylinders are not contributing as much as the others. Causing an imbalance vibration. Now the popping noise could be a partial backfire into the exhaust or intake from a valve not sealing well or valve train concern. I recommend having a service done that runs the engine off of a cleaning chemical to clean the injectors and combustion chamber, then replace the plugs. If it continues run a engine off compression test then one again while running.
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Hello again Chris here,