this one really has me going in circles. My STFT are positive 24 each bank. i have changed the fuel pumps, fuel pressure regulator, MAF Sensor and the Temp sensor. I have no idea why this car is running lean. After I changed the pumps it ran nice and rich for about 10 minutes and then back to lean. Any help would e greatly appreciated.

 

The last thing I could think of and what I was hopping would bring an end to my jags lean running condition was to change the fuel filter, thinking that it may would be clogged. This did not work as the lean condition continues, I will check the fuel pressure . If this comes out normal then I could honestly say that I dont have a clue as to what could be the problem, I thought that I knew my car, guess your never to old to learn something new.