Driver Side Exhaust
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99 ranger runs rough intermittently. Runs perfect when vacuum line to exhaust/air valve removed and plugged???
There's a vacuum pot on the side of the intake (3.0) which I can only guess directs air into the exhaust, but on the driver's side only. The engine will begin to surge at idle. Sometimes it clears up by itself, but not always. When the vacuum line is pulled it immediately idles up and runs fine. Plugging the line with my finger, it returns to normal idle speed.
Anyone here been through this already?
Sounds like the IAC (idle air control valve) is not doing its job and needs to be checked as pulling the vacuum line will make the engine run lean.
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