Hey guys... I have a pair of 2001 500 EFIs with Boostpower induction package on them (tb's, filters, spacers, computers, etc). Motors have roughly 150 hours on them. Port motor is a champ, runs perfect, idles forever. Starboard motor likes to cut out at idle occasionaly and can be difficult to restart warm. If I cut the motors off to talk to someone it can take a few minutes of cranking for it to fire. Above idle they both run like champs, don't miss a beat and run identical on instrumentation. Any ideas? No alarms or horns. I'm betting it's some sensor, IAC, TPS, or something simple.

I would think IAC, sometimes you can take it out and clean it with carb cleaner. it screws out.

I was thinking IAC valve as well, Have you tried to move the throttle forward when cranking to see if that helped it start any easier?

swap out the iac with the other engine,,to check it

What did you find on this? I'm having the same issues.

Sounds like vapor lock.

If it were the port motor on a pre-2002 500efi I'd swear it was vapor lock.....the starboard can still have that issue but the port fuel pump bwing sandwiched between the 2 engines is usually what causes vapor lock (obviously worse when hot out)

Mine is the starboard.