This really helped the tune-up of my 97 Odyssey and it was a very simple process. I had noticed after spraying out the throttle body with carb. cleaner, the engine seemed to run worse. After stumbling across the link below, I figure I flushed most of the carbon and gunk into these ports whenever I sprayed the throttle body out. The ports and tray were almost completely clogged. Also my injestors looked like they were growing hair. I used a small round brass wire brush attachment on my cordless drill to clean my ports and toothbrush with carb. cleaner to clean injector ports. I also used a shop vac. on all ports to pull out any trash I could that might have fallen into the injector chambers. Took only seconds. the tray I scraped with a flathead screwdriver and sprayed out with carb. cleaner.

Many thanks to whoever posted this. This also took away some of the valve noise I was hearing as well.

http://home.comcast.net/~em-engineering/T2T013.pdf