Q: Abs,traction control, speedometer malfunction

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Abs,traction control, (check engine light twice in last month) come on simultaneously then speedometer stops working. Happens randomly,but more frequent in last 1.5month. Shopped diagnose and repairs have. Not corrected issues(front left axle and speed sensor replaced and codes reset). Dealership not sure - mentioned could be IAC or carbon build up on engine? Both repair shops say all systems test normally on diagnostic and road testing.
My car has an automatic transmission.

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