vaccume leak, dirty throttle plate, bad Idle Air Control, Stuck open EGR Valve... Rick ASE L-1 Master TransMichigan.com
faulty brake light switch (on pedal)
this could be you're ABS sensor
possibly a bad brake switch located on the brake pedal assy
A brake fluid leak in the system would do that. Check the brake fluid reservoir. If it is empty you are in need of brake work asap!
check the brake pedal switch
Under the dash, near the top of the brake pedal arm.
Check the stop light switch - usually located at the upper end of the brake pedal under dash area
manualy lift brake pedal to see if they go out. if so check spring at pedal
Check the brake light switch on the brake pedal
under the dash about 6inches above the brake pedal under the dash about 6 inches above the brake pedal
It is on a bracket next to the brake pedal.
On the bracket that the brake pedal pivots on.