New engine gremlins - frustrating

nm9stheham said

OK, I am inclined the same way, but timing can combine with lean/rich carb conditions to produce symptoms like this. I too am inclined towards a lean condition, but would be looking more at secondary throttle plate settings and things related to the transition circuits for such a random thing. Did you say it only happened after coasting through a turn, or did you really mean to say 'not always' after a turn?

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From what I notice it has been coasting/slowing down after completing a turn and then apply light throttle at about 5-10 mph. It stumbles/chokes to almost dies, pops back through the carb and takes off. A turn might be a coincidence just because of the low speed conditions. I'm incline to say that I have only noticed it after a turn, but I only test drove it for 5 miles.

I have not seen it occur off idle from a standstill.

I will check with him on the timing this week. He has in the past worked on performance Chevelles that I have seen in his shop. Weather getting crummy in Chicago and not the ideal time to do this. Engine was delivered at Labor Day.