I have this exact same problem with my 86' S10. It could be any of the following things:
-Gunk in the Throttle Body (easy clean)
-Throttle Position Sensor is bad (replace)
-Throttle Position Sensor is not calibrated properly
-Gas Pedal inside the cap is loose (tighten it up and lube it)
-a linkage from the accelerator cable and the TBI is wonky
If you run some codes with an ODB1 computer, you'll be able to tell if its the TPS or something mechanical that's wonky along the throttle linkages.
I've just brought my truck in this morning to put in a brand spankin' new throttle body injection unit, but that's probably overkill. I'll let you know if its a linkage, and I've wasted my money.
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Tuesday, July 12th, 2011 AT 3:37 PM