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I had something similar (ish) with my 80 SC five years ago now.
Popped and sputtered at around 3k, then went away after a few seconds. Got to work and left it, came back after work and thing would barely start. Turned out to be a bad lambda ECU - one of the solder joints was completely burnt.
Did you check whether you get a buzz/vibration from your frequency valve with the car off, key in the on position, and the plug at the AFM unplugged?
Could be O2 relay as well...
Lots of diagnosis threads for all of the components above in the Pelican archives.
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