So today i took my bike to work and it was riding great, while working it started to rain a bit so i had to go home. As i pulled away and began accelorating then suddenly the rpms dropped to zero and then right back up to where they had been before, it did this in 2nd and 3rd gear a few times. Each time there was a lot of jerking... As soon as i shifted into fourth the bike ran great (obviously i did not push the bike to see if anything sound wrong because it was a little wet out). Any ideas what this could be? When i left the bike was a bit wet, and it was raining. It's from 1993 and i just purchased it from a guy who kept it in a heated room for 10 years and never registered it and also hardly rode it (never on the road). Any suggestions about what it might be? I'm going to take it out again once it stops raining, its also going to the garage to get the tires done, oil change, lube of spline...what else should i ask them to look at? Thanks a lot!