Ok so as the title says my 1990 turbo wont rev in gear. It will rev fine in park/neutral. Had an issue with no boost but got that resolved. Now the issue is that when in Reverse or D or any gear it will only rev up to 2000 RPM. Thought it was the fuel pump so I checked it and it was making a weird grinding noise so I put the original back in and it sounds like its running fine. I can rev to 2000 RPM or so in gear and if I do this with my foot on the brake and the parking brake on it will build up to 5 PSI of boost fairly quickly. Checked for vacuum leaks and such and could find none. Valve timing is dead on and ignition timing is set at 20 degrees BTDC with the vacuum advance mod done and gonna be running 15 pound of boost with a 2.8 bar pressure regulator and SD fuel chip. Also when I put the car in gear most of the time the revs will drop and die almost instantly. Only started doing this after I fixed my vacuum leaks. Idles a little high at 1000 but I had dialed it down to 850 thats normal and it still does the same thing. AIC was just cleaned and slightly oiled with WD-40. TPS adjusted properly so that it clicks when throttle is lightly pressed. Although I haven't checked to make sure it is working properly. So my question is what could the issue be? I have no way to check fuel pressure right now. And I want to get the issue of it dieing when put in gear fixed before anything.