Mazda Tribute Engine Idle Erratic

This Vehicle Use To Run Really Well. Last Few Months The Idle Has Begun To 'hunt', In Other Words. It Goes Up And Down - (700 -...

Dosnt Want To Stay Idleing When Cold And Check Engine Lite Wont Come On.

Problem Keeping Vehicle Going In Morning When Engine Is Cold. Hooked Up To Computer And Showed Missing On All 6 Cylinders. What Could Be...