Iv fitted a gauge and set the fuel pressure at idle so that's spot on, the engine has done 0 miles so need to run it in before I get it mapped, the way it's going il need to get it set up to run it in! All sensors are new so all it can be really is the pot on the ecu needs adjusting ? Or possibly the chip, but this was running spot on in a different car with identical spec? It also has a new throttle body that I havnt set up
Yet but can't see this causing the poor running?