I received this for Christmas and installed this electric accelerator pedal on my 1949 Chevy pickup with a 350 engine (Edelbrock 1405). After installing it, I noticed that it had an open port that allowed the vacuum to exit. This messed up my air/fuel ratio, so I called Edelbrock Tech Support. They told me this is to protect the coil from overheating and everything should be fine. It didn't sound right, but that's how they designed it. I tried adjusting the A/F ratio but the unmeasured vacuumβ¦