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My Ranger has failed TX. emissions with high HC and NOX readings.

(1993 Ford Ranger)
in Fort Worth, TX on August 10, 2014
Has new plugs, wires, coils, ICM, ECM, harmonic balancer pulley, new T-belt and crank sensor. Repaired/replaced vacuum lines. Smells a little rich at idle, at times, MPG is solid @ 24 mpg, mostly hiway 12 mile range to work.
need help pretty bad.
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