Just recently I would start my car up and the engine would start at 1100 RPM later rise to 2200 RPM and then start revving up and down. I always wait until it drops below 1k to drive it. Second problem I recently noticed was my car is overheating after I drive it hard. The temp gauge would go 2 marks below the H Mark. Dunno if these two problems are related but it seems like these two problems popped up at the same time.