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High NOx levels and failed smog test 5 times. replaced cat,plugs,cap,O2,intake on 1992 Jeep Cherokee

gasket,exhaust manifold, oil, oil filter, coolant,injector seals, and MAP sensor. Still getting 1300 read @ 25mph. this sucks

Asked by for the 1992 Jeep Cherokee
NOX IS CREATED BY HIGH COMBUSTION TEMPS. IS COOLING SYSTEM IN GOOD SHAPE AND ANYTHING ELSE THAT WOULD RAISE CYCLINDER TEMPS.
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