1997 ZJ - 200K on the clock - every once in a while, at a stop light or sign, the revs will drop and, if I don't pop it into neutral, die. Re-starts at once. No impact from weather (hot, cold, dry, wet, it'll die) - no CEL thrown, performance is the same as it has been since I bought it at 150K - plugs fresh last summer - might replace the cap, rotor and wires just to be sure. Ideas?