I've got a 2000 4.2 v6 Standard Transmission with 160,000 on it. I've recently had problems with it being hard to start (I have to give it a little gas) and a rough idle. A few times as I coast to a stop sign the engine dies.

It's been maintained decently. The Spark plugs are about 30,000 old, I just changed to oil/filter. Air filter is good. I've got an O2 sensor that has needed changing for a while. I did just wash my engine but I covered all the electrical stuff well.

Help me diagnose the rough idle, dying while idling. It's an intermittent problem not continual but getting worse.