My wife's 2008 has a sparatic issue with her ex 2wd. She is saying that when she goes from park to D or R that it wont engage when she let's off the brake. She pushes on the gas it supposedly wont even rev, like the gas pedal isn't working. It has been going on for a month or so. Everytime I get into it, it engages exactly like it should. I even feel it shift and then let my foot off the brake and it moves in the desired direction. I did some general research and found that sometimes the shifting lever would be stuck and unable to move but hers is fine it move as was designed. Any thoughts on what the issue is before I have to spent money on a hunch and it's not the problem?