I replaced my turbo and now my car runs like ass. It starts fine but idles even higher than it used to (I know i have a vacume leak, but nothing's changed since then). When I try to accelerate a little bit, everything's ok, but if I try to get on it a bit, then it is very sluggish and after I let off the throttle, the RPM's drop to 0. If I give it a bit of gas, then it comes back to life. Only codes are 42 and 52 (speed sensor and knock sensor) and I had those before. Any ideas, stuff to check, etc? I have to drive this fucker to work tomorrow, i really need it to run.