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I've got a '95 auto. I've cleaned the EGR repeatedly but haven't been able to get in there deep enough to keep the code from returning. There's a good video on Youtube on cleaning the EGR; check it out.
That said, I'd pull the plugs and replace them as needed. That cleared up a misfire on mine. I'd also invest in an Ultraguage if you haven't already; it's good for reading codes, but the real value comes from helping you mod your driving style.
The best highway mpg I've gotten on mine is 45 in the winter, and I know I can easily push that to 50 and beyond once the weather warms up. Similarly, I've had city trips that cracked 40; driving mods will get you the numbers you're looking for once you've cleared any glaring mechanical errors.
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