Thanks. She(owner) said that there is a slight hesitation when she accelerates to merge onto the interstate. Actually no code-reader is needed. It's built in, just count the blinks. I'll just do the plugs and wires and try some fuel injected cleaner. Check for codes and then move on from there. She hasn't mentioned CEL being on.

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1995 E420 152k
1991 300D 2.5 348116 daily driver
1992 300E 2.6 196k-work in progress(head gasket)
2002 BMW 745Li 93k