It sounds like there might be a problem with the anti-lock brake system
that is causing the modulation pump to pulse. It pulses the brake fluid
pressure to prevent the wheels from locking during hard braking. A
malfunction of the system might cause symptoms you describe.
What you are describing resembles an engine miss but there seems to be
something lost in the language. Has the motor had a "tune up" or any other
work performed recently? Can you describe exactly what it is you feel when
the problem is occuring?
You say this only happens when you are stopped.
Since, when you're stopped, the only thing that would produce that
sort of vibration has to be something turning in the engine
compartment, that narrows it down.
(Unlkess your tranny's torque converter is going bad, but that should
vibrate more as the engine is revved up.)
Is the CEL on?
Open the hood; is the engine vibrating? Moving around on its mounts?
Any pullies broken/bent? Belts broken?
It can't be the brakes if it's happening *after* you've stopped.
Do you feel the pulsation through the brake pedal, the steering wheel,
or the seat?
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