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I had an ICU go out. It is the silver box attached to the coil, right? Mine and the one I borrowed to test (from a 500 SEL) were in the driver’s front fender well and held on by 3 screws. The one under the passenger foot well is the LAMBDA control, isn’t it? Also replaced the idle speed control module, which is behind the glove box. Your surge in idle could be a number of things. Vacuum, Idle speed control module, air slide valve, ICU… Good luck!
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Steve
1985 Mercedes 500SL Euro (Gray market)
1995 BMW 520i Euro (Gray market)
1992 BMW 525it Wagon
1994 Honda Del Sol Si
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