02 Saturn Vue 3.0L misfire 1 and 3 cylinders

Up into 2002 those 3.0 v6 engine's had issue's with there timing belt tenisor's they redesigned them you can tell which one it has. The old design just has one pulley down by the lower left side facing the engine. The new design they moved the tensioner to the middle top of the engine and it has the idler and the tenisoner pulley on the same bracket.I would inspect the timing belt to see if it jumped time. Also if it has a aftermarket alarm that could be interfering with the ignition pluses from emi. There is a bulletin on that.I would also make sure you have spark to those cylinder's and injector pulse from the ecm use a noid light that way you know your getting power and the ecm pulse. Let me know what you find.