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I have tried replacing the air filter and oil change added some zmax multi system microlubricant and I'm still having the same issues. The car idles rough, at stop lights, both when its cold and when its hot but more frequently when its hot. Occasionally while it's hot and I'm cruising at a steady speed there is hesitation in the engine. The engine is a 2.7 v6, on my 1999 Dodge Intrepid se. The engine is not throwing any codes.