tryin to break in new engine, ruff idle

The jets could be too small. You say its for a newer car :cry:

That is a great sign the motor runs better with the choke on. Its your carb, thats for sure. I would jet it up, if you got wire drills, ope the jets up .005, even .010.

I got a feeling those jets are special and harder to get. If anybody has them it be Summit Racing. The problem is the idle bleeds might be too small also, why best to get different carb. Even a holley but not emissions type.

Yep, dirt cheap me would just carefully drill the jets a bit larger, no point putting money in to a half *** anything. Needs a good old 750 vacuum secondary holley