right iv got a fueling problem on my 3dr cosworth wot its doing is when the car is nise and warm i can set the fueling on the ECU with the help of my stack AFR gauge and set it to about 14.7 / 14.4 and the fuel reg is running at 3bar and 3.5bar with the pipe of . so then i go for a drive and bring it onto boost and bang it back fires like a dog and the AFR gauge is in the RED very very lean i pull up and the AFR setules in the mid 12,s i then pull off and it gose very lean till im just hovering the gas . pull up and the fueling is in the RED again very lean .iv just done a test on the wires running the FPS and the MAP and the wires are all good the car is on its second fuel reg which is holding pressure good as i have a gauge which i can see wot the fuel pressure .
SO WOT DO YOU THINK IT COULD BE THEN