my 2000 GV does that too. When it was my grandpa's he had it sitting outside of his garage for about a week or more and I had to move it and it took forever to get it started. Also, if you are parking it and you happen to stall it while doing so, it's best to start it up right away if you are planning on leaving it parked there for more than a few minutes. I was moving mine one morning and I was using the fast idle RPM's to get it moving and not using the gas pedal and as I backed up a small hill in my front yard it stalled and i just left it all day. at the end of the day, it would not start. had to crank it with the gas to the floor to turn it over, took quite a while. Still runs great so I guess it's just a little wierdness thease 2.5 V6's have