Rough idle combined with hesitation off the line on a Cherokee doing mostly short city trips does fit the clogged injector pattern your mate described. Short runs prevent the fuel system from reaching temperatures that naturally clean deposits so they build up faster than highway driving would allow.

The contrast you’re describing between this specific low speed hesitation and otherwise flawless refinement is actually the most useful diagnostic information you have. That precision of observation makes communicating the fault to any specialist much more effective than vague descriptions of something feeling slightly off.