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What does the fuel pressure gauge do when you shut down? If you have an injector leaking, the pressure will drop fairly fast. This can cause a long start and run rich.

I would still be looking towards the P0455 code. You can unplug and cap the EVAP hose (intake side) and see if it runs properly. If the valve isn't closing, it creates a large vacuum leak.

Usually by the time I get to bleed the abs, someone has tried conventional bleeding enough that I have clean fluid in the lines. I am a retired senior master tech and have done several that the abs bleed w/ scanner wouldn't clear. (Mustangs come to mind first), but have done several and never...

I use a reverse bleeder, pressurized fluid at each wheel back to master (just remember to suck the fluid out of the master first. Check valves in the abs will allow fluid to pass backwards, taking any trapped air with it. If you have a helper, they can watch the master and see when it starts...

As a retired senior master tech and service manager at a dealership, I've seen it many times. As stated , tech unplugged to check a/f and failed to plug it back in. They almost always claim they plugged it in. We would clear the codes and verify it was fixed, then give the customer a free oil...