2005 Chrysler Town and Country

Engine Performance problem
2005 Chrysler Town and Country 6 cyl Front Wheel Drive Automatic 99000 miles

I was experiencing engine performance problems: Poor acceleration, rough idling, occasional backfires particularly when my engine was cold or had not been running for more than 15 minutes. My mechanic replaced the EGR valve. I experience the same performance problems over the next 3 days (about 200 miles) but then it seemed to stop after that. Does a new EGR valve take time to acclimate to its new environment before it starts working properly?
Mr Hanky
March 2, 2009.

EGR valve goes to work right away, but your PCM will take 2 uninterrupted cycles to adjust to the new inputs from the new EGR valve.

Mar 4, 2009.