This morning as I exited a busy beltway my 3.4 litre V6 (185k miles) cut off. I was able top restart it as I drifted down the ramp, but as soon as I took my foot off the gas it died again. I tried turning on the A/C to see if that would keep the idle up, but no help - it just increased the RPMs slightly like it normally would. I limped the 4runner to work switching between D and N and regulating the idle by foot (no easy task in heavy city traffic!) I am sure there is some (hopefully simple) bolt-on widget that tells the engine to idle at X RPMs. If anyone has had this experience, any advice would be helpful and save me from a paying a mechanic or worse the dealer!! Thanks!!