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A methodical 4-pulse miss at cruising speed

(2000 Acura Integra)
in Galion, OH on September 26, 2010
A methodical 4-pulse miss at cruising speed between 55-64 mph. New plugs, wires, distributor, throttle positioner sensor, new upstream O2 sensor have all been installed. Need to install downstream O2 sensor as per check engine code. Generally more prevalent when engine reaches running temp usually within 2-3 miles. Any ideas on the problem?
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