This is a common Contique quirk. Do a search it's been discussed in great length. The A/C compressor places a load on the engine, and as it cycles on and off, the load is thus removed/replaced.
-'96 SE MTX 3L
-'98 SVT 1,173 of 6,535
-'05 Mazda 6s, loaded, g/f's ride
-Need a 96-00 manual on CD? PM or email me
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