Review on 🔧 Enhance Carburetor Performance with Edelbrock 1464 Step-Up Spring Pack - Pack of 5 by Richard Nonya

My truck hasn't idled since I installed the Edelbrock 1406. I thought the problem was the ignition timing but it was exactly the same so I played around with it for months. Then I found them and decided that for $10 it was worth a try. I measured the engine vacuum at the drive and got 17 inches of mercury. Divide this by two to get 8.5 and then substitute the feather that comes closest to this value, which is the natural color feather (8 Hg). The stumbling is completely gone! Hope this makes sense and helped someone.