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Fix what's broken first, then look at modding. As for the idle, if it's below about 50 degrees outside it runs rich for a while to warm up, so it's at a higher RPM (think choke on a carb, just computerized).
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2003 Alero GL2 LA1: pacesetter cat back, Energy Speed WAI, Magnaflow downpipe/cat, tinted tail lights, and polished letters on intake manifold.
1987 Honda Rebel 450
1967 Buick Riviera 430 Wildcat: roadworthy but needs restoration.
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