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Slight miss on acceleration or low speed

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I have a 1982 C10 Scottsdale with the 4.1 .250  inline 6. After I discovered the ignition control module and the plug wires were bad, I finally got it going again. I also replaced the coil on its HEI system. without vacuum for advance it is at 4 degrees before vacuum is applied. It runs decent and idles pretty good but on acceleration to low speed, I'd say 10-20 MPH I feel a small miss from time to time. It's not severe but I want an idea of where that may be coming from. After fixing things and setting the timing, I have gotten it up to 70 mph nearly and I couldn't feel any miss at a higher speed under load but it seems to only be on acceleration or low speed. Has the original carburetor and pretty much everything else is original besides ignition parts and such. Any ideas or where to start or what to look for? Thanks!

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