I have a 95 Turus 3.0 L FFV. which I had stored since last winter. When shifting the transmision from park to anything, it does not engage immedietly. I have to rev the engin brfore it engages. Once it engages, its ok till I take my foot off the gas peddal, then it disengage and have to go through the reving process again. The car drives ok when its engaged, and I drove the car before storage and it was fine. Any advise as what might be wrong with the car???