'95 E420 - DM Codes 3, 4 & 25 - What to do next?

[Syntax26]

Anyone like to advise on my next step? What to replace/repair?

'95 E420 - 100,000 miles. Replaced engine wiring harness, ICM & spark plugs (Bosch F8 DC4) 5,000 miles ago - car was running great. CEL light came on - been pulling DM codes 3, 4 & 25 - erase them - they come back within few miles. Checked plugs and vacuum lines - all appear good. Cleaned MAP - same codes. Always runs 92 octane or higher.

Symptoms: Car runs great at mid-high RPM after accelerating. Car runs great idling in park. Problem is rough idle when in gear, brake on (such as at stop sign) AND upon accelerating from standing start or very low mph (10 mph or less).

Car still has original O2 sensors - but I'm hesitant to replace since not pulling codes for them.

Should I start with replacing knock sensors? (Code 25).

If lambda control is indicated (Code 3) - what do I actually replace/repair?

Any advice would be appreciated. THANKS!

By the way - I put a sport suspension in the car (springs, sway bar, shocks, brakes) and love it. Like a new car - so highly recommend anyone thinking about it.