1st time poster; thanks in advance for any help in this matter. My girlfriend has a 2004 Explorer with a 4.0L SOHC engine. About 2 weeks ago she tried to start it and it didn't want to turn over. After trying numerous times she finally got it started but it was idling very rough and was at low RPMs; after about a minute or so it died. She tried again to start it but wasn't having any luck. We let it sit for a day then tried again and I noticed that when she was trying to start it she had the gas pedal all the way to the floor. I figured she flooded it so let it sit another day. Tried to start it again and was getting the same start issue; hard to turn over, started, idled very rough, low RPMs, then died. At this point I also smelled gas and there was some white smoke coming out of tailpipe. Next step was to get an OBD II reader and search for codes. Four codes came up that I though were the problem, P0301, P0302, P0303, and P2195. Looked up the codes and found that the P030 codes were misfires in cylinders 1,2 & 3; P2195 was Os sensor stuck lean bank 1 sensor 1. So, went to Autozone and bought all new spark plugs and all new wires. Installed the plugs and wires.....same issue. Hard to turn over, rough idle, low RMPs, stalls then dies. The P030 codes were gone though. Hooked up the OBD reader again and now am getting P2195 and P2197. I know what the codes mean but I'm trying to pinpoint a cause. I have been all over this forum and google and have found it could be anything from a dirty MAF sensor to a catalytic converter failure. I am not the most savvy mechanic at all and have actually learned more from this issue than anything in the past. Can someone please hold my hand and maybe walk me through some basic checks/cleaning/parts issues that could be causing her truck to not want to start, idle rough, stall and then die? She has two kids and no transportation nor the $$$ to take to a dealer or mechanic. Any help would be heaven sent! EDIT: I forgot to mention as well; the only way to keep the engine running to get under the hood and manually open the throttle all the way. If you try to open the throttle with the gas pedal the engine stalls and dies almost immediately.