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So finally took it to my Mechanic a while back and my transmission shop had swapped the upstream O2 Sensor cables. They said on cylinder bank was way lean and one was way rich. No wonder it ran like crap!

Cool I will check that out too. Just talked to my bother in-law, who is a mechanic. He thinks it is a vacuum leak somewhere because the fuel trims are so high at idle, like +25.

I don't know how to check it and I have not replaced it. I did see a pending code on my scanner say high fuel pressure, but it never actually was issued to cause the engine light turn on.

I don't think I have found that one. I will check it. Thx!

No Codes. I have a cheap scanner that hooks up to DashCommand software on my iPad. I need to see if it will actually log data. Fuel Trims are way out of wack when it is running bad, like +25 and I can smell fuel. So it seems to be running really rich.

The Mac has been on the car since 2008 and about 75K. The MAF is plugged in.

This is only my second post ever, but I hope someone can help because I am at my wits end. I have a 99 Cobra with 240k and a few bolt on mods (MAC CAI, Borla Catback, Steeda Underdrive Pullies, John Lund Tune). Used to run really smooth. Now after I had my clutch replaced (thought maybe the...

I've read these forums for years and benefited a ton by everyone's posts! Thank you all! I figured it was time to give back and relate what I went through debugging and correcting my Po190 and Repeating P1151 codes on my 1999 Mustang Cobra. It all started when my 1999 Mustang Cobra kicked out...