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If its been without the line for over a year, I Highly doubt it. Look into IAC valve. Most are installed with 2 screws, easy to adjust. Idle Air Control Valve. Look that up, for a start.
Sounds like your gas cable is loose or has slipped off the injector pump. It simply clips onto the pump. Locate your injector/fuel pump and check the wire cable going to it is connected. You should also be able to manually rev up your engine from there by pushing the fuel level back and forth. see how you go. All the best
first off.... does the engine over rev on its own? or only after you press the gas pedal?
does your vehicle have a throttle body that is electronic or cable actuated?..if electronic and revs on own could be one of two issues 1) throttle body itself 2)throttle pedal switch on gas pedal)
if cable and revs after pushing gas pedal ..either there is too much carbon built up on the throttle plate or the throttle cable has begun to fail.. remove the intake tube from the air cleaner to the throttle body and inspect
You need to check the cable the runs from the gas pedal to the engine, it might be rusty and need some drops of penetrating oil at the point it meets with the engine accelerator valve.
Is there somthing hitting the gas pedal, like the floor mat? Or maybe something under the dash came loose and is getting caught under the brake pedal and pushing on the gas. Put the shifter in neutral if you get into a situation where going to hit something or someone. The engine has a rev limiter, to prevent it from over reving.
Most likely it is running too ritch. should be around 7%. Mine did ecactly the same thing and I had several things done . Had the throttle body cleaned and installed a O2 senser.runs great now.
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