1. Fuel pump (submerged in tank) may be the problem
Or you may need the serious injector cleaning done by your friendly GM dealer.
The 3800 has been GREAT engine for decades. Doesn't have intake leak problems like 4.3 and the 3.2. Lots of grunt, still used (updated) in a multitude of GM products.
Have them check fuel pressure. You may be surprised by the results.
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