A cam can have an influence. The Toyota EFI isn't as sensitive to cam changes as *some* domestic systems because it doesn't use a MAP sensor. As such, vacuum at idle doesn't matter as much to the EFI..

Coming from Chevy motors, you know that a lot of things are going on internally. You've done some work that you think narrows it down to the cam. I'd suggest, in order to confirm, that you'd have to swap the OEM cam back in and have everything work right to know for 100% sure.

If these camshafts couldn't be setup on EFI systems, Ted wouldn't sell them.