Car Bucking

Vent is new and was checked last year when I put a new one on, no blockage.
Checked gas cap last night after it had quit, no gush at all.
Fuel pressure set at 6.5-7lbs.
I use two carb gaskets with a metal one in-between.
All fuel lines are good.
Last year when I had this problem the first thing I checked was fuel filter and all was good, no crude in it.

It always started after being at a higher MPH for a while then it does not matter what mph I'm at, it just keeps getting worst. I kept it going by feathering the throttle and jabbing it.
I'll check the fuel cites to check the level of fuel, its a 850DP Holley.

I have not checked the sock yet, I'll check that tonight.
Not running vacuum dizzy
I'll also check plugs

Thanks guys hope this new info will help.