Buick Rendezvous Won't Idle!

thegredsthegreds Member Posts: 1
edited August 2015 in Buick
So, my Buick won't idle. This happened for the first time about a month ago. My gas gauge was broken, so I figured I would fill it up and add a fuel cleaner to see if that would help. I took it to a mechanic for diagnosis and they could only come up with an O2 sensor. By then, the problem was fixed! It seemed like the fuel cleaner had worked it's magic.

Well, it just happened again this morning. I have filled up twice since then and have not added more cleaner. I imagine I need to change my fuel filter, but I'm not sure why it won't idle.

Even bigger mystery: my gas gauge has moved. It is no longer stuck at 1/4 tank... in fact, it seems like it's at about the correct level for how much gas should be in it.

What could it be?
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