Have a 2004 tribute, 3.0 v-6. OBD-2 detectes misfire first 1000 revs, random/multiple misfires,misfires #1 and#4 (last week also showed misfires #2 and #3 ). Have replaced all coilpack on affected cylinders and upper and lower intake gaskets. Should I be looking at intake? Anyone have any insite?

 

try EGR vacuum solenoid. They will cause similar symptoms. Common failure in this vehicle.