I successfully eliminated the 3800rpm stumble from my car. I did not reground the ecu to do it either. I just installed a Jacobs ignition. It worked. I was not expecting it to do that but my brother noticed that it wasn’t there when we drove it today after installing it. So I tried to initiate the stumble but try as I might it wouldn’t do it. The car also starts up much faster. I don’t know about any horse power gains but those two things along sold me and made my money well spent. https://www.nopistons.com/forums/pub...#>/biggrin.png

i hear ya there brother, the jacobs boxs is the ****. i ran one for the longest time befor i went stand alone, but now im goin back to it do spark break up under high boost.