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engine idle problems

Engine

Vehicle Information: Year: 2000; Engine (type, size, modifications): stock - no mods; Total Mileage: approx 60 K;

i have a 2000 boxster s with approx 60K miles. over the past several months i have been noticing an engine idle problem. when i am at a stop light the revs fluctuate - they drop and rise constantly. the car seems to shudder when revs drop, and then come back to normal. i do not have any loads on the car (a/c, fans, etc.). i have had the maf sensor replaced - but the problem still exists. the car is well taken care of. no engine/exhaust mods, stock air filter, daily driver.any thoughts as to what is going on?

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