I had an issue with my 1986 C10 with a 350 and Edelbrock 600 carburetor that would stall if I sat in traffic for more than 5 minutes. I've also had seemingly unrelated idle issues, rich power, low low-end torque. I was able to route the vacuum lines correctly and get the timing right, but I still had some issues. After installing this seal I have no more problems! In fact, my truck starts right after hot stars where it used to require some gas swimming! Good product!