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RPM fluctuation when driving

If you have an automatic transmission from which most of the fluid has leaked out, the torque converter will sometimes "slip" as air gets into the mechanism instead of fluid. This may happen ...
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RPM fluctuation when driving

Two questions here: "What would cause the car RPM to fluctuate" Pressing or letting off the accelerator. Changing load on the engine due to hills, wind, A/C compressor. "cause a ...
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