I just traded my Subaru for a Pathfinder, and for some reason when you start it up, the RPS go straight to 3. Now, I have listened to the engine, and it sounds fine (aside from the ticking manifold I need to replace), and it doesn't sound like it's revving as high as that (no where near). When you shut it off, it goes back down to zero, but also doesn't seem to change while driving. What are some thoughts on what I might need to replace to fix that? I'm also replacing the thermostat, coolant temp sensor, and exhaust manifold.