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Right at the '93-94 era....the powertrain codes changed from EO to PO.

So....if I am looking at the service manual correctly. A EO27 is 'open throttle position switch.'

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With the engine at idle, press on the ISC plunger till it retracts.

When it bottoms out, unplug it.

Now adjust it to a .060 gap and then plug it back in.
If it is also surging, that is indicative of a vacuum leak somewhere.

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  • 2 weeks later...

TSB on that, if its a flat TPS on the backside its been replaced by an update with a indent on the back body of the TPS. TPS min air rate and extended ISC and an idle learn .

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