Junkyard 7447 on an AMC 360 in the Honcho.
It's been surging at idle for some time now. Real random. Ran fine though.
Finally got around to doing some tuning in tuner pro and found where it said 'error low TPS'. I've had a spare TPS banging around in the center console for the past year or so. Slapped it in, cleared codes and now she runs much better! Oh and it was already wallowed out so I could get a good .54 V
First time I've had a TBI component fail, that is all