Intermittent Cruise Failure

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95 2500 auto Ocassionally the vehicle slows down when the cruise is set. Other times the cruise will just drop out. Turning the off/on switch to off and then on will allow the speed to be reset on occasion. Other times I have to wait for a period of time and then retry. Have checked the TPS, brakelight switch, and vacuum supply. All seem to be in good shape. Any Suggestions???

 

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Brother in Law had a similiar problem. Dealer was going to replace some cruise control systems, but because of quote price, he took it to a private shop. , They found it was a sending unit (cant tell you which). With a new sending unit problems went away.

Vaughn

 

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Probably Vehicle speed sensor.
Vehicle speed sensor located at transmission.
Also check speed control servo its under left(driver's side) battery tray. It has both vacuum and electrical function.