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I had a 383 built last month and it was running great. The shop had to fix a few leaks. They removed the intake manifold to fix one leak. After completion, it now has a slight surge. The idle RPM is about 700 but it used to be 800 before the leak repair. It idles like this: bum, bum, bum, bum, BUM, bum, bum, bum, BUM, bum...Hope that explains how it sounds.
It has a kinda lumpy cam but I can tell the difference from before. The surge is noticeable even with the fairly rough idle. It is very minor but it is driving me crazy. It wasn't like that before. When it is in drive and idling, if I keep my foot lightly on the brake, I can feel this slight surge of power. Is it caused by idling too low or is it a fuel mixture problem, etc.? I don't see how they could have touched anything on the carb when reinstalling the intake. I hate to take it back to them for the 6th time. They may think that I am crying wolf because I keep going back to them. I paid a ton so it should be right! I am just tired of dealing with this speed shop in VA. I am going to increase the idle speed tomorrow when I am free. I just want to get a heads up in case that does not solve the problem. I have no idea how to adjust fuel mixture properly on my 770 Holley Avenger carb if that is the problem. How does one accurately do that without a machine or analyzer? I hope this is the right forum for this question. Or should it be in the "Engines" forum? Thanks, DeAngelo