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Hoping I'm right about this one, but would like to hear what you guys think. I had a slight sputtering issue at high rpm. A can of injector cleaner and it would run great for a couple dozen miles, then pick up again. I decided to fill it up with high octane and a half can of sea foam for good measure. Now, it's much worse. Almost like it's struggling to pull fuel. It sputters and shudders pretty bad. I replaced the fuel filter and pcv, cleaned egr valve to no avail. My main issue is I can't find the adapter to hook up a fuel pressure tester to the rail. I've looked and it seems you have to special order it. Question for you guys- could the catalytic converter be causing this and throwing an egr code? I'm guessing it would be injectors, plugs, or fuel pump but hadn't considered the cat until a buddy told me about a similar experience he had that was caused by a clogged cat. Any similar experiences and outcomes would be greatly appreciated too