| Not only do DW's suck, but these ones are giving you trouble. I think you do have a leaky one, you should see some white smoke from that bank pretty much all the time. A 370 tune with 550's will run you rich all the time.
It idles/low speeds fairly well likely because the O2's tell the ECU it's very rich and the ECU turns down the duty cycle. (which the injectors can work with) Once you go out of the range where O2's affect ECU injector control it relies solely on the map.
(Which isn't made for injectors that are smaller so it dumps more fuel than necessary) If I were looking at a Z that had that garbage in there I'd figure the replacement injectors into the price.
Cheapest (Bernie's OEM new-style used) is ~$500, otherwise you're looking at ~$900-$1200(300* rails) and I don't eat that kind of cash, it'd have to come out of the sale price.
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