I have a 2003 Ford Escape which was running fine up until two months ago. All of a sudden it was making a slight noise and giving me an oxygen sensor code. I replaced the oxygen sensor and then I got a leak. I thought it was the oil pressure switch so I replaced it, but it turned out to be the power steering pressure switch and so I replaced that! I also replaced the manifold gasket, 5 out of 6 spark plugs, and just recently bought an EGR valve. I got a misfire on startup today after I replaced the valve and it was running with a putter but no codes came up. I ran it a bit and got two oxygen sensor codes and the startup misfire code. When I was out at the store I started up my car, or tried to I should say, and it just died after startup. It happened three times in a row but after I pressed on the gas and finally was able to put it into gear I was on my way. The engine makes this puttering sound and when you press on the pedal it sounds like a baby chick is in the engine but ever so slightly, like that sound isn’t crazy loud at all but I can hear it.
I am at my wit’s end with this vehicle! Can someone give me some advice??? I would GREATLY appreciate it!
SIDE NOTE: I was thinking it was a Cam shaft sensor problem. Thoughts?