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A couple of things are wrong. First the TB has a 4.2 in-line 6 as it's base engine. The 4.3 v-6 has been around for years and was in many GM vehicles including the smaller Blazer, but not the Trailblazer. Are you sure that you may not have a 5.3 v8 in your EXT? Still the mileage should not be that bad. Take it to the dealer.
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