Hi
I have taken my 2wd sierra cosworth stage 1 to stage 3 by changing the yellow injectors to dark green, adding a 3 bar map sensor and stage 3 chip. I have taken the car out and it was running quite lump at first but got it warm and it was a little better. AS SOON as I tried to hit the boost, it coughs and splutters and no boost. Is this common? does it need setting?? or have i just done something wrong?
Any ideas and info would be appreciated.
CHeers Goy