Just got the oil changed. I brought the van home and pulled into my garage and put the Van in Park and the engine started idling back and forth between 1k and 1.5 k, but no check engine light. Turned off engine. About 30 minutes later, took van back out to driveway, put it in park, started to idle back and forth, check engine light came on, then idle hovered around 1.5k and TCS light comes on. This happens only in park. 2001 LX, 145k, warranty tranny at 100k