I have a 06 pacifica touring AWD and I notice when the engine is not warm when I push the gas pedal the car do not response for a couples of seconds. I when to the dealer and the told me was wrong spark plugs and a bad EGR valve and wrong spark plugs, and because the bad EGR valve the fuel injector can be clog, they recommend fuel injectors service. I changed EGR valve and spark plugs and do the fuel injector service. The problem is still there. Does anybody have any idea about this???? Thanks!

 

Sounds more like a TPS (throttle position sensor) issue. I had a similar problem on a Dodge Daytona and Pontiac Sunbird. Replacing the TPS solved it. Since the computer didn't get the correct signal about how far the throttle was pressed timing was adjusted accordingly.