I Have A 1998 Chevy Suburban, And Lately Out Of The Blue The Rpms And

[gurlynmgurl]

Speedometer Does Not Move,? But If I Turn It Off ( The Truck) And Turn It On Again It Works Properly! What The Heck Is Going On?

[SCOTT JW]

replace the speedodmer cable

[Sophie B]

probably a bad ground..next time it does it try whacking the dash, right above the speedometer with your fist....