RPMs lower than normal; car dying.

Okay.

Earlier today, I was driving and my rpms started dropping and check engine light came on. So I went to Autozone and asked them to do the code reader, and it came up: "System Too Lean (Bank 1)". The woman at Autozone said that it was probabily my O2 sensors messing up and I needed new ones. So, I'm driving later, and it does the rpm dropping thing, but than it starts dying. Eventually I get it started back up, and all is good until later tonight. Well.. Right now it's parked infront of a bank in town because it keeps doing the rpm thing and dying. A cop pulled up behind me and watched my back while I slowly made it up the road so I wouldn't get hit because I had to keep restarting it, and he said it sounded like my fuel pump was dying. Could the OBD-II code htingy be saying that its running too lean BECAUSE of the fuel pump, or could the O2 sensors messing up be causing that? I was just curious as to what it sounds like to you guys because I bring it to a shop and they try to screw me over.

Thanks for any advice you can give!

Well, after that

Get your fuel pressure checked to start with ,change the fuel filter first , go from there. This is for the `04 Cavy? how many miles on it ?

This is the 2004 Chevy, 77k-ish miles. My dad put it in the shop.. so I guess we'll find out what it is. Couldn't even drive it there, had to get a tow truck. Oh well. Thanks anyway guys heh.

Its probably a combination of both the fuel filter and O2 sensor.

Repair shops telling us it's the fuel pump and/or the fuel relay switch. =( Oh well. Nothing I can do about that. Heh.

ok the obdii reader would pick up that its to lean if its not getting enough fuel this dosent meen that the o2 sensor is bad but that your car is runing all though a malfuncting o2 sensor can read this it is less likely