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I've had Volvos since 1973, and have never had the stalling problems you mention even in bumper-to-bumper, summertime traffic jams on the NJ Garden State Parkway in 100+ deg heat. This, i.e., that it isn't characteristic of Volvos, is in agreement with the replies to your post of others as well.
And although many of the respondents have also offered suggestions (e.g., bad power stage amplifier, airbox thermostat, etc.), these things are unlikely to hit all five of your cars at the same time! So since you have five cars spanning 8 model years (and f.i. systems spanning LH2.0 to 2.4), all of which are suffering the same problem simultaneously, I think that it makes sense looking at what they could all have in common.
The only thing I can think of is your gasoline -- possibly you fill up all five cars at the same neighborhood gas station. I can't help thinking about vapor lock as one possibility, which shouldn't happen with these cars, of course, given the pre-pump in the tank, but bad gas could be the culprit common to all five of your cars.
So consider whether there might be something not-up-to-par with the quality of the fuel they sell. Is it a name-brand station (Exxon, Amoco, Shell, or Chevron), or a no-name, cut-rate station. Their tank may be contaminated, or they sell fuel without the usual additive packages. The fuel may not have the necessary volatility index for summer heat.
Good luck.
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