300000 miles on my 2002 town and country limited 3.8

What is your question?

Everything still works as it should but with all the miles I have no check engine light no leaks its had nothing done to it for the last 75000 miles except a battery. The problem is when I drive it the check engine light stays off but when my wife drives it the light comes on it goes back off after I drive it a few times . It has a nervous idle at start up but seems to go away once you get going. I thought a 300000 mile service I don't know what that includes new plugs and wires and filters new belt the AC has work great never been open up or work on but my compressor is much louder than when it was new. When I turn the compressor off you can barely hear the engine run should I drive it till the compressor goes or replace it now. Its not clutch noise its more of a raddle noise I don't hear it going down the road but I do when I'm at a drive threw or pull into my garage I hear the old compressor should I go a head and replace it now . What about the throttle body should it be taken off and cleaned good or just have it clean on the van and does my 3.8 have an EGR if so it is the factory one and I also can feel the vibration of the engine a little the motor mounts are the original ones there is 2 motor mounts and two transmission mounts do I need to do all 4 or just the engine mounts. I thought about replacing them. The transmission it was rebuilt at 210000 I should service it .Any advice about any of this my knowledge is limited when it comes to a 300000 mile vehicle .