The Idle Control Valve is under the air filter, drivers side, forward. Many posts in this forum regarding location and descriptions. Easy to pull out, test with a 12V input, and clean. They get gummed up with age, and cleaning with a carbon buster like carb cleaner helps. The in/out vacuum hoses can get brittle over time, and they should be replaced if cleaning doesn't help. Luckily all I had to do was clean the valve out. Still working fine - no stalling.

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93 190E Sportline (RIP) (45K)
92 190E (Xferred most Sportline parts to this body)
88 300CE (71K)

And the Jeeps:
01 2WD Cherokee XJ (35K, Mama's grocery/kid hauler)
91 4WD Comanche (300HP stroker)