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While in drive or driving, when trying to come to a full stop or trying to slow down, the car will continue to accelerate. Only after pressing the brake down hard will the car stop accelerating on its own.
Basically without pressing on the acceleration the car will accelerate on it’s on very slowly.
Normally when releasing the acceleration pedal, the car will slowly slow down on its own, instead now it maintains the speed and even increases.

 
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Sounds like your throttle body is hanging up check to see if it returns correctly when done by hand. Or it could be you throttle body control sensor (located on the throttle body itself black with 2 screws in it.
I had this problem when I got my GUDE throttle body so they sent me a new one

 
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so don't know what your talking about hah, i have an auto sedan, so what do you mean? return by hand?

 
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found out my compustar alarm siren fell into my engine bay and got stuck in the throttle, thats messed up

 
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how does that happen, really, was your alarm in the intake box so thieves couldnt find it?

 
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Siren, not the alarm feel into my throttle....... why would the alarm be in the intake box?..... plus i have injen CAI

 
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LOL...it would have been funny if you had taken it to the dealer with a pissed off attitude...LOL