Q: Rough idle and smoking issue

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I started my truck and a big puff of white smoke came out didn't think much of it , as I was going down the highway about 75mph I about 10 mins later I punched it to 90 and about a 1/4 a mile I stoped at an intersection and my car had a very rough idle. Any idea what causing it.

My car has 124000 miles.
My car has an automatic transmission.

Hello there, many faults will cause your 1999 Dodge Durango to have a rough idle and smoke. There are several different colors of smoke that can come from and engine. Grey smoke is typically oil, black smoke is unburnt fuel or a rich condition, and white smoke is typically coolant.

Given than your vehicle runs poorly I suspect the smoke is grey and is being burned. This can occur due to a fault in the PCV system, intake manifold issues, or low engine compression.

To avoid any unnecessary repairs, a qualified technician such as one from YourMechanic will be able to diagnose your smoking engine and rough idle firsthand.

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