Thread: Idle Surging

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My youngest daughter has an '01 Dodge Durango, 4 wheel drive, automatic,and 4.7 engine. With the air off it idles smooth and accelerates fine. When you turn the air on the idle jumps up to about 1200 rpm comes back down to about 800 or so and fluctuates from then on. At speed it does the same thing, but it doesn't always do it. It's got a little over 108 thousand on the clock. I was thinking a partially clogged fuel filter, but the filter is in the tank. Anybody have any ideas?

One idea would be the fuel pressure regulator. Gauge it, check it well, strong indication that the reg has finally softened and let go.

Thanks nitrowarrior, I hadn't thought of that.

Denny, the kids are in Oklahoma for the weekend and yes the AC system is low on charge. Must have had a geezer moment because for some reason I didn't connect the two. When they get back I'll put the gauges on it and bring it up to spec and that should solve the problem. Since they only have one vehicle I'll wait until the fall to leak test it and fix it properly. Thanks for your help.