Hey guys i'm having a similar issue. My 03 is bogging down in the rain.. It has had an issue with an unsteady idle in cold weather but the other day it seemed to be running just fine. Until it started raining really heavy. It started sputtering as if i was running out of gas while i was splitting lanes on the freeway in heavy rain. Pulling the clutch in and peppering the throttle seemed to help it out, but it was def choking up and not getting gas properly or maybe water getting in the system somehow? I
ended up having to pull over because it died on me. Managed to start it back up and just had to play with it on back roads the whole way home. When i got closer to home i noticed either smoke or steam coming up from between the forks near the radiator. The temp gauge was ice cold, she hadn't even really warmed up. Seemed like the sputtering started in 3rd gear and up. Any ideas where to start wrenching first?