its a 383 stroker from blueprint motors. originally, it had an edlebrock carb, but they gave me a holley after the edelbrocks were giving customers problems.



now, when given gas off idle, itll stumble for a second, then rev up like normal. happens in neutral and when driving. ive had people suggest timing, fuel level in the carb, and even needing a walbro 255.


it has the stock fuel pump (it was originally a 305 TPI), to a pressure regulator set around 3-4psi.


the timing is set properly, as best as i could do it. im not sure of the holley model. i did unscrew the big brass screw on the front of the carb, and fuel came out, so i dont think its starving for fuel off idle.


im not very experienced in carbs, at least not in tuning them. any ideas?

 

Try going through the tuning post. Start by checking the fuel level and the basics. Sounds like you could use a hair more PSI, around 7 is normal but I doubt that will solve the problem. Im guessing you need to adjust the accelerator pump linkage and or cam and or squirters. Have a look at sofa's tuning sticky here:

https://www.thirdgen.org/forums/carb...ey-tuning.html