For me in the past it was ignition related. i have had it with fouled plugs, poor wires.
When a plug goes to fire, the coil output builds up to the point when the mix ionizes, then discharges thru the spark. As the mixture density increases, (more throttle) , the voltage has to build higher (to the limits of the coil) to the point where the mixture ionizes and the spark discharges.
At the increased voltage, poor plugs and wiring start to show up.
George
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"...out to my ol'55, I pulled away slowly, feeling so holy, god knows i was feeling alive"....written by Tom Wait from the Eagles' Live From The Forum
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