2000 Dodge Durango SLT, 5.2 liter
I've had that same issue with the RPMs dropping and vehicle surging forward at stop lights. Occasionally it will die at idle, but restarts immediately. I have done a major tune up(plugs, wires, cap, rotor, distributor), cleaned throttle body, replaced throttle position sensor, crank sensor, and idle air control valve. Found a vacuum leak @throttle body gasket - replaced, but still persists. Replaced computer. This seemed to have helped for a day, but problem is still there.
I had a flow master muffler put on a couple years ago. About 6 months ago I noticed a rattle and verified it was from the flow master, so I had it warrantied. That surging and dying problem went away for a couple months, but has come back. I am at a loss here. I am a service manager at an auto repair shop and no one can figure this thing out, mostly because it is so random and won't act up long enough to allow for proper testing. Fortunately for me, I can buy parts at cost, install myself, and return if they don't fix the problem. I'm guessing there is probably either another intermittent vacuum leak, or head gasket/cracked head issue. I have researched with all of our shop tools and browsed numerous forums on the internet and I am still stuck with the same problem.
