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Hello. I would be glad to assist you. Which engine is in your vehicle? 3.9L or a 4.2L? If you don't know, what is the 8th digit of the VIN number. The VIN number can be located on the driver's door/jam and the dash by the bottom corner of the driver's side windshield.
I am going to have to call my Step-daughter and ask her the engine size. Please hold for a couple of minutes.
Take your time
It is a 3.9 L engine.
I apologize . I said that I suspected the O2 "concentrator" - I meant O2 SENSOR!
I wouldn't think that the engine would idle-up so smoothly if a "coil", or ignition module" device was at fault.
Thank you. The problem here is most likely a large vacuum leak causing a lean air mixture. Most common (very common) are the crankcase ventilation hoses to crack or collapse causing a vacuum leak. Also, the air intake tubes crack and cause this problem. The clamps on the air intake tubes must be tight and secured properly to seal correctly. There are 2 of the crankcase ventilation tubes one to each valve cover. Inspect them closely looking for any cracks or holes. Make sure they are on as well. There are also a number of other vacuum hoses that can rip/tear causing vacuum leaks. All vacuum hoses are of little expense to repair. Other possibilities are a leaking intake gasket. These are common to fail as well. Intake gaskets can be a significant expense $300 to $400 depending on shop rates. It is unlikely that the oxygen (O2) sensors are causing this problem. The best way to diagnose this problem is using a smoke machine. This is a machine that releases smoke. By hooking up a smoke machine to the air intake, you can easily pinpoint any vacuum leaks.
OK - then, that's interesting - not what I suspected, but it makes sense. Your efforts are appreciated. /thank you so much, and I do "accept" your opinion.