ok thanks
one more question
does the ecu have a vacum line running to it? or no?

reason i ask is they made so many changes from pre-tier1 and tier1 , i need to know so i can figure out which system is on this. There are several service bulletins to look through. also some had a check valve in the vacum line between the converter and the intake air inlet hose some did not.
And with the mixer thing, the diaphram first came out without a shim between the bullet/shutoff button and diaphram centerplate and there was a barcode sticker on it, but they had issues exactly how you are explaining and they later came out with a revised diaphram, the newer one has the shim and no barcode sticker on it.
And so far every mixer i've looked at does have that dwell screw located under the screw journal at the base of the mixer body behind a plug. If that mixer is a aftermarket part then that may be a problem and it will not work.