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Question: What could cause my gas pedal to stick

So lately my gas pedal has been "sticking". Not sticking in the down position, but sticking in the up position...as in you can't press down on the gas pedal. This only happens when the engine is cold and when you push on the gas pedal for the first time. You need to apply a good amount of pressure to "loosen" the gas pedal, and after that it works normally.

Any ideas what could cause this? Like I said it only does it for that first push on the pedal when the engine is cold..it works normally after that.