tryin to break in new engine, ruff idle

screeminDemon said

The fuel lines and tank are clean, but thanks for your input Green1.
DodgeFreak I'm glad you agree wth me its a carb issue. I'm seriously considering getting a new carb now, even though I just blew 50 bucks rebuilding this Holley 600.

But I'm also worried about my big cam and Edelbrock Torker II manifold. I read this today on another website "Very good for high-rpm use, these manifolds can be a real challenge to tune for low-end, street rpm

use. A single plane manifold will typically significantly reduce vacuum, and this causes several problems."​

Click to expand...

I didn't put the huge cam my 340 has so I cannot say what it is but the thing idles like a full out racer. The car has a torker 340 and probably a 750 size double pumper with no choke. The engine doesn't come on till 2500 RPM but will idle just fine at 900. If I don't start it by stomping on the gas 6 times before firing it the carb will backfire and has flamed before.

You have any plug wires touching each other and letting them crossfire? Are you using premium gas (hopefully without jokenol)?