So I’ll just throw in my experience as I’m similar setup with aem pumps in radium kit running 51 psi, stillen intake, stillen exhaust, Bosch ev14 550cc injectors tuned by seb and on e85 and my idle is completely fine so I’d say just a hunch but less to do with running e85 on a z and more to do with the 1050 injectors. That’s a lot of injector for an NA car anyway and from what I’ve ever heard and read is the larger the injector the harder it is to get a controlled idle as that’s where the engine is pickiest and the hardest point to control a large injector.
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