I have an xterra 2001 186K miles V6 automatic. After the truck has been sitting overnight or for a number of hours there is a long lag between when I shift into drive and when the transmission engages. It takes upwards of a full minute to engage. In reverse it will engage immediately. This lag started about a year ago but was only a few seconds, now it has deteriorated. After it engages it will drive fine for the rest of the day. I found out if I shifted to low it will engage sooner with only a couple of seconds lag. Any similar experience or suggestions.