My 93 Range Rover did the same thing this past spring. The problem for me turned out to be the idle air bypass motor on the back of the plenum. I removed it by unscrewing it from the housing and blasted all the gunk and carbon deposits off with carb and choke cleaner. I also changed all the pcv hoses, flame trap and breather foam on the back of the valve cover. This seemed to clear up the problem and now I regularly clean out the idle bypass motor to prevent it. Basically the engine was just being choked to death at idle. I ended up doing the same thing by revving it at stoplights although it became a pain after the first couple times.
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