Carb throat popping at speed, New Problem!!! Options

[LetoAtreides]

Ok, so I know I've posted this before, but I still cant figure it out, and I need to know all of the possible circumstances under which this condition occurs.

One of the throads on my dual carbs is excessively lout at speed. It sounds like pop-pop-pop.

Any ideas?

[LetoAtreides]

Ok, sorry about the bogus numbers. I thought the main jets were the ones that pump gas when the accelerator is pulled, and the venturii were the small tubes next to the carb throats.

I'll see if I can find my carb info today.

Plugs are Bosch, don't know the number but got them from Rich Bontempi at High Performance House, so they should be good. I'll check that number today. Wires and connectors are all good. I'll test the spark today.

I'll try the accurate mixture screw adjustment you have. Previously I set the mixture as per the DellOrto manual: Hook up an electronic tach and turn them in until the engine loses speed and then turn them out until it stops gaining speed.

Ok, The gas in my car is 87 octane, so low-grade. I didn't just guess on this one, I looked up the octane rating for the 1.7 engine online. I'll try a midgrade, though and see if that helps.