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Just happend 2 days ago. idling in neutral it now is around 1200 when it was always like 750 when warm.

87 5.0 efi
 

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Obviously, a vacuum leak somewhere. It might be a sticking throttle, the IAC, the plenum gasket, the brake booster... Does the throttle lever return to the stop screw every time without assistance?
 

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Another possibility is your tp (throttle position ) sensor. It mounts on the side of the throttle body. It is fairly common for those to do that. Good luck
 
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