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I changed out the fuel pump and fuel sending unit. The fuel pump was leaking back through the check valve. I broke the sending unit removing it. But I am still getting really rough idle, no ability to rev, and some quiet pops of backfire (I guess). But the fuel pressure is holding rock solid. I'm scratching my head for ideas. I've tried to verify the vacuum system. The vacuum to the fuel pressure regulator is good. And I can trace the other side down to the vacuum canister and the 4 way tee. But I can't see much past that. And I don't know visually that I could see a leak unless it was obvious. Could it be injectors?
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