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Intermittent but not Random. No misfire under load or while driving. It idles and run rough while stopped after 15 minutes of driving in temperatures above 50 degrees. Runs smoother in temperatures under 50 degrees and sometimes while raining. Maintenance - 2011-2013 No codes Vacuum - 22 in. HG Steady = Good Compression - Good Fuel Pressure - Key on, not running, 40 psi = Good Fuel Pressure - Key on, engine running, 32.5 = Good Spark plugs replaced - 2012 Spark plug wires replaced - 2012 Distributor and cap replaced - 2012 Coolant Temperature sensor replaced - 2011 Throttle position sensor replaced - 2012 Camshaft position sensor replaced - 2013 I listened to each of the 6 fuel injectors. 4 sounded smooth but 2 are a bit noisy. But all are working. Oil changed - Jan. 2013 Fuel filter changed - March 2013 Coolant Changed - Feb. 2013 Valve cover gaskets replaced - June 2012 Fuel system cleaned - Feb. 2013 Throttle body cleaned - March 2013 EGR valve - applied vacuum, the engine stalled. It passed. NOT CHECKED Ignition timing. May have been adjusted when distributor was replaced. Not sure. The fuel strainer on the fuel pump not checked but fuel presser is good.