19lb injectors are way too big for this engine, even with a matching chip there can be idle problems. But more important in my opinion is the fact that for a stock engine the OE injectors are more than enough to achieve 12.8-13:1 across the entire band. It takes a chip tune to get there, but the injectors aren't the bottleneck. That being the case, larger injectors aren't needed and wont, by themselves, result in a performance increase.
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o2 check engine light with sporatic idle and studdering
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