The air tube needs to be flexible to do it's job. Trying to repair an old brittle/cracked one IMO is a complete waste of time (won't last if it can't flex). Here's a post from another thread:

Quote Originally Posted by timsrv View Post
I ordered one from Toyota less than a year ago and they were still available. It is Toyota part #17881-73020 and sells for about $75 on most of the discount internet Toyota parts sites (expect to pay over $100 at a Toyota dealer).



Some people have repaired with silicone, duct tape, and other such things. Personally I consider anything that requires such a repair a complete waste of time. I have found good ones in the salvage yards before and always grab them as spares (for when Toyota quits selling them). Tim
As for the igniter, the factory service manual says "try another igniter" (that's as close as they get to testing them). Tim