Check for any interference between the throttle body and throttle plates and between the air horn and air valve (if so equipped).
I once owned a 1979 Trans AM with TA 6.6 Pontiac 400 CI engine and 4 speed transmission.
Due to an intermittent stumble upon acceleration (another issue entirely and quite a subtle problem in itself), I rebuilt the Rochester Quadrajet carburetor (no help, as it did not need rebuilding). Upon reassembly, I followed the German, goodentight practice when tighteninig the screws attaching the hair horn to the float bowl, overtightening them in the process.
The added stress caused the air horn casting to deform over the next several months, eventually resulting in an interference between the secondary air valve and the air horn. The interference was extremely minor, resulting in no visible evidence to the naked eye, but was enough to prevent the secondary air valve from opening in certain conditions, depending upon temperature, etc.
The air valve seemed to always work properly when trying to find the gremlin but would hang up in the worst possible situations.
It took me over a year to find the gremlin but 10 seconds with a Dremel tool solved it once found.
Wish I still had the two 1979 WS6 TA 6.6 Trans AMs that I once owned, especially the 10 year anniversary model with 1,200 miles.
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Today's Featured Article - The River Tractor - by Charlie English Jr.. This is a 4010 John Deere that was used to farm on the Diamond Island which is in the Ohio River about 15 miles southwest of Evansville, Indiana. About ten years ago, this tractor was parked close to the bank as the river was washing the bank of the island away.
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