HAd the indy check for any codes and diagnose. They pulled some stored misfire codes, check the plugs and wires and cleaned those things out to ensure there is a good conenction.

Gave it a few days after and the problem is almost gone. It may hesitate very lightly a t low RPM. The problem definately appears to be water related. I know it seems obvious, but it's good to have a concrete answer.

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'97 E300
'99 E300