Do you have a CEL, or a way to pull codes from the ECU? Not all stored codes will throw a CEL, just fyi. If you don't have a datalogger, I would recommend investing in one.

Just off the top of my head - Check for Boost Leaks, make sure your MAS is plugged in and operational (no loose connections, bad wires, etc), and check your coolant temp sensor and related wiring as well (scroll to the end of the article for pics and test procedure for the temp sensor). There are a few other possibilities, but we'll start with the most basic and move forward from there.

Any other details to this problem? i.e. did you replace any parts just before this started happening, or was it just "out of the blue"?

...I'll try it this afternoon.



Mike