Mitsubishi Repair Problems? Ask a Mechanic for Answers ASAP
What year and model is this vehicle?
Is this a manual or automatic transmission?
When you press the gas pedal does the engine rev up (like you were in neutral), does it bog down (audibly hear it struggling but RPM does not go up) or does nothing happen?
If there is absolutely zero response from the engine when you press the gas pedal then there is something failed between the gas pedal and the throttle body itself. If the linkage on the side of the throttle body is moving when the pedal is pressed, then there is likely a failure inside the throttle body. Have a helper press the gas pedal while you watch the linkage on the side of the throttle... it should twist open and shut with pedal application. If it does not, then there is a broken cable; again if it does, then there is something wrong inside the throttle.
There is really nothing else to consider if nothing happens when the pedal is pressed. Any other failure would result in at the least the engine stumbling/bogging or reacting in some way... only failure of the throttle to open would result in zero response.