Ive got an 02 Focus 2.0L Ztec, MIL came on and I pulled P0402 Excessive EGR flow. I checked any visable damage to EGR, vacum lines and DPFE, all is good. I cleared the code. After driving for a while about a week later, came to stop and engine started to hesitate. MIL came on again and it had the same code. Sprayed vacum lines and no signs of leaks. Any suggestions. Trying to keep this low budget, and going on long road trip soon so need to fix car ASAP. Even some diag tips would be appreciated especially because I don't wanna play a dart game.