you have whats called the 3700rpm hesitation, its basically all has to do with mazda's horrible grounding in there harnesses. you need to reground a few things and add some redundant grounds to the engine and chassis and it will fix it
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if you havent been in a small plane its worst, cause your eyes and brain say we are moving and your body says oh no we are not. eyes and brain go asshole we are moving, cant you see? body says fuck you we are not moving at all. so they fight and fight and eventualy your body says, you know what fuck you brain, see if you can stop this!! then you throw up.