This sounds typical- old plugs with old wires can cause a lot of misfire issues. If the wires are old enough that you don't remember them being replaced its probably time. I would also check around on what plugs work best with the 3800 engine. I am about to change plugs and possibly wires on a 2005 Impala I bought for my son to drive to school. A mechanic warned me years ago that the individual coils (COP) for each spark plug are more susceptible to failure if the plugs are old, worn and dirty. The coil works harder getting the spark than if the plug is in good condition. The cost of replacing the plug is minimal compared to replacing the coil - or multiple coils.
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