Cross-posted from another thread:

I think I may have bad manifold sealing rings. When I spray brake cleaner anywhere near the engine (literally anywhere) the idle jumps up quite a bit.

When I spray the injectors, some make the idle jump more than others... but when I spray down between the air mass meter and the distributor, the idle REALLY jumps, almost like I revved the engine using the throttle! Does this point to bad manifold seal rings/donuts?

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Current cars:
2000 ML55 AMG, 174k miles
2003 C240 T-Modell, 202k miles
1995 S320, 207k Miles