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Pull the idle air control valve off and clean the carbon out of it, make sure it can move freely. Then put it back together and see if that helped. Good luck.
id do the 60k mile tune up first.
then if still bad.
find out if the problem is spark (test spark)
or bad fueling, check for flooding at any spark plug.
if not flooding (spark tips , read) then try test fuel.
if flooded try super secret unflood mode,
that is crank with wide open throttle.
if ISC is stuck closed, try cranking with 10% throttle (adds the missing air)
Wide open as in wide open throttle?? You mean the engine is racing? Something is wrong with the throttle controls, or the throttle valve in the carburetor may be sticking open. Look down the carb throat. At its base will be the throttle valves-"butterfly" valves just like the choke valve on top of carb. The throttle valve should be closed at rest, or at idle, or when gas pedal is not moved. Rotate the throttle lever on the carburetor by hand (when gas pedal is pressed down, the throttle is rotated). The throttle valve at the bottom of the carb should open and close with the throttle lever.
If the valve is sticking, spray some carburetor cleaner down it, and spray the outside clean, too. Work the throttle back and forth to make sure it is free to move.
For a high idle, have the carburetor adjusted. Timing should be checked, too-that can cause a high idle, but wouldn't cause it to go wide open.
Let us know what you find. Good luck.
Disconnect the MAF sensor and see if it changes rpm's. Pull off the big boot at the intake. Is the throttle valve wide open? If it is, the throttle body assembly needs cleaning-maybe it is stuck? Have you scanned for trouble codes?
Okay this vehicle is 27 years old. It may well have out lived its usefulness. Have you thought about getting a newer vehicle that does not cause such problems?
The first thing you need to check is the Throttle Valve Cable. This cable runs from the throttle body to the transmission and controls gear changes according to throttle position. It may have come disconnected from the throttle lever, or could even be stuck in a "wide-open" position. If this cable is okay then there is a real good chance that the direct clutches have failed. This clutch pack is used in 3rd and 4th gears.
Get you one of those carburator/throttle body cleaner and spray the throttle. ( Where the gas pedal cable is connected on the engine, that is where the throttle is). You would have to remove the intake hoses attached to it then work that throttle manually as you spray cleaner to it. This should get rid of the gas pedal getting stucked and maybe the low idle problem as well.
usually a lifter that extends too far making the valve stick too far open for a short time.My 2000 f 150 did that last summer.try using thinner oil or at least 5w30,or use a engine cleaner to clean the inside before a oil change(YOU CAN ALSO USE DIESEL FUEL TO CLEAN IT,JUST LET IT IDLE FOR A SHORT TIME,ABOUT 5 MINUTES)and i use a valvoline oil in mine.Of what i can think of is maybe dirt gets into the lifter causing oil NOT to drain out,causing the lifter to extend too far.
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