Is why GM used Thermac on 300 units. Thermac is to stop "carb freeze." 300 TBI can freeze under some weather conditions. (87&up duke w/ 700 series doesn't have the freeze issue.)
You know when that happens... sadly when it happens on the road, likely in traffic.
and freezing a carb/tbi doesn't mean freezing weather.
Most freeze I've seen you have crap idle or can't idle at all. Stop to look at the problem? Engine temp quick thaws and hides the problem.
Fiero has "cold air intake" from factory... If you have this issue... Careful disconnect cold air at air cleaner. Make sure won't hit the exhaust.
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
The Ogre's Fiero Cave (It's also at the top and bottom of every forum page...)