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Did you replace the belt or reuse the old one--the old one has probably stretched out and that would retard your timing such that it runs sluggish at low rpms and runs great at high rpm.
If you have one of those hand-operated vacuum pumps you could try adding some more EGR while driving down the road at cruise to feel how it affects the power. The whole concept of EGR has never made much sense to me--pollute the charge air to weaken the power...oh yeah that's a great idea...?
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