Hello everyone! I am new to your club, I stumbled across it while cruizin.
I have a question maybe you can help me with. I have a 70 mustang, I call her my baby, she has developed what I call an engine surge. At idle the motor will hunt and surge. It is very rythmic and the rpm will vary between 300 - 700. When I accelerate the motor will stutter briefly then between 2500 -3500 rpm I can feel her surging as well. At about 4000 rpm it seems to stop, but I truly cannot tell. I have good oil pres at throttle 68psi, my fuel pres seems good as well. I checked all of my vacuum lines, the plugs are all connected, the wires seem fine, and my timing is about 3-4 deg advanced.
The motor is a 351 cleveland with a Holley 600 4bbl that flows 900cfm.
Honestly, I feel the motor is not getting enough air, but I am only guessing

Any help would be great. I apologize if this is a repeat topic.