The CEL came on my '88 420 SEL on my way in to work tonight as I was accelerating to get on the highway. Car still runs smooth, but has a fairly high idle (about 1200 RPM). I'm getting a DTC of 3, which I'm assuming is the EA/ISC. Is that correct? Once the car cools down and is restarted, the idle is fine. As it warms up, the idle begins to increase.

The car is a California model and has 131K miles. No other codes are set.

Any idea what could be causing this? TIA.

__________________
I'm wanted in four states, but it's all good. Got me a new driver's license and a sweet new pickup. V-8, Baby, five-hundred horsepower. Oh, and four of them mudflaps with the naked ladies on them. GRRRRRRRR, MAMASITA!!! And the best part is, it's all free!!! Yeah, well, for me at least!!!! HA-HA-HA-HA-HA!!!!