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I've considered adding EGR to my engine. Unfortunately, MAP based systems are probably the most "thrown off" by EGR, as they have no way to differentiate between exhaust gases and fresh air. Adding EGR can decrease manifold vacuum, so the computer behaves as if it's running at higher load, by adding fuel and pulling timing. Generally speaking, you want the opposite to happen. A few precent EGR and it probably does net good, but the gain would be similarly small.
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