1998 Chrysler Sebring intermittent misfire on stopping, the

At 100K miles, had intermittent engine misfire after coming to a stop, mostly within 1 mile after starting, but also after having driven for an hour. Had spark plugs, spark plug wires, rotor replaced by competent mechanic. Did not fix the problem, disconnected the EGR hose from EGR valve after mechanic detected code for it. Ran for 2 weeks ok with EGR disconnected, then on a wet morning misfire on 2 or 3 cylinders, light throttle would cause all cylinders to fire eventually. After rain/fog overnight would not start after 3 tries, floored gas pedal, and after wait, the car would start. A competent Mechanic is stumped. I cannot drive the car in rain do not trust it for work round trips of 120 miles because it may quit and leave me stranded.

Car gets 24 mpg and was a good get to work vehicle.
I am willing to spend a reasonable amount of time/money and effort to get another year or two out of her. The intermittent nature of the problem is what is so frustrating.