Hey I figured I would ask for some ideas ,
1980 Vette ,ZZ4 motor( 2500 miles ) 3.55 rear , headers, 2 1/2 dual exhaust . holley 750 vac secondaries .
It seams like it miss fires when I hit it and the rpm and power climb , I hear it in the exhaust and feel it , it does seam to get past it and builds power and rpm . So it is not a stumble it is more like a miss fire , I am sure there is power loss but it feels slight meaning the car is not hesitating or bucking it powers through it.
To me it seams to happen when the 4 barrels are all opening , it is a new holley (750 vac ) I set it up with a vac gauge and on initial install i had 12 or 13 inches of vac , after i worked on mixture screws an now I got a solid 17 inches of vac.
Car idles perfect , starts perfect , runs smooth , cool , and for the most part is tip top !
So any ideas where I can go searching for this apparent miss firing ? My gut tells me the carb is leaning out or that when the back 2 begin to open I am not rich enough and am fuel starved and I should have bought the 750 double pumper not the single pump vac secondaries ..
Or not ...lol
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1980 , ZZ430 , 3.92 rear , 700R4 2400 stall NEW EZ EFI