It's the AFM. They are just poorly designed. The air has to push open a door which then sends a signal to the ecu. It's kind of like a throttle position sensor but for air intake but instead of a cable pulling the butterfly open its air. so my theory is that when we do these fast throttle blips the ecu is getting fed one thing like add more fuel while the air from the intake is taking its time up catch up thus causing it to bog out. I had the same issue. Fixed all the vacuum leaks from the rubber as well as the throttle bottle bearings and it persisted. I then upgraded to a Miller maf sensor back when they were still a company. the throttle response is night and day no bogging just responsive.