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Could be your Exhaust Back Pressure Valve (EBPV, the butterfly valve on the turbo's exhaust outlet) closing. You can try disconnecting the actuator solenoid and see if it helps. Look for a 2-wire weatherpack-type connector down by the base of the turbo on the driver's side. The valve is supposed to be for faster engine warmup, but it's really not that helpful in that regard. Cheers!
 

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It didn't set the CEL on my 94 when I modified the pedestal and deleted the valve. I also don't remember any codes being stored. I think the 97's (at least California models) will set the CEL with the solenoid disconnected. In that case you can use a resistor in the connector to make the PCM think it's still connected (solenoid resistance is approx. 12.2Ω, use 10Ω 1-watt resistor). Cheers!
 

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Just in case you feel like running some tests, here are the Introduction and Pinpoint Tests for the EPR. When you get the circuit fault, is it a stored code without CEL or CEL with stored code? Cheers!
 

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