Frequently in older vehicles, high humidity or rainy weather can cause poor performance, usually because of a problem in the ignition system. Moisture and condensation may be forming in the distributor. Also, the ignition (suppression) wires may be old and arcing from one cable to another, causing timing issues and misfire problems. That problem is aggravated by moisture and humidity.
A lot depends on when it is sputtering. Is it hesitating under acceleration? That is what happens most commonly in eclipses. It is probably a misfire in one of the cylinders. Change your plugs and wires.
seaweed is
What causes a car to jerk while driving can be based on many factors. A car can sputter due to engine compression issues, bad transmission, engine misfire, bad spark plugs or even low fuel.
What causes misfire 302, 304 and 306
sounds like a ignition breaking down from heat, scan codes good change ther is a cylinder misfire code. if plugs are old and have excessive gap this causes coils to work harder to jump a big gap the bigger the gap the coil has to produce more voltage a heat causing overload on coil
Because it's an Audi and they suck!
Misfire detection.
the gun powder ispacked to tightly and the preassure builds up and can cause it to misfire
Rain.
Try disconnection your MAF ( mass airflow sensor ) and if it doesn't sputter when you accelarate, it means your sensor is gonzo.
In general (very loosely) a misfire can be a bad plug, wire or coil.
Time to replace seals, this usually causes misfire.