fueling problem

[COLEYST200]

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

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[tabetha]

Stop wasting your time and money, and get it mapped correctly, any faults will also become apparent and be dealt with.
Is your lambda calibrated ?
tabetha

[COLEYST200]

all i no is its a stack one and its plug and play i got it off martin . and also iv now got the ££££ put a side to have it all mapped but i now there is a problem and i just wont to sort it then as soon as its sorted i will ring martin to get it booked in . as if i dont sort it out my self it means im having to pay martin to do it ontop of having it all setup and mapped hope you under stand wot im saying