Make sure the vacuum line is plugged in to the diaghram on top of the ECR and NOT on to the vacuum pot on the side of the EGR valve. If it is plugged in there it will close the flapper plate and choke off the engine. Also check the beginning of injection (will need laptop with Pathfinder) as if way too low engine will run retarded and bog down. Check vacuum to turbocharger with vacuum gun. Unplug vacuum line AT turbo and plug on to vacuum gun, start engine, MUST HAVE 18 to 20 inches of vacuum as soon as engine starts, if not check all vacuum hoses for leaks. IF SO, plug line and hook gun to turbo, apply 20 inches vacuum to turbo and test run by extending upright all the way up until it bottoms out - a good turbo and engine will maintain 2000 millibar of boost and 2800 rpm if everything in pathfinder is set at 100% - Hope this gets you in the right direction. Always check the turbo output as even a new one may not be performing correctly by nt letting the wastegate function correctly which is why you need to check the vacuum and manually apply vacuum to the wastgate control