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 - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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