Rough idle and code p0171 ford zx2?

Here's the deal. I've replaced damn near everything. Fuel filter injectors plugs coil wires PVC valve and both elbows did a timing belt and components job. I've got a lean code a rough idle and no low end power. It's been like this since I bought it and I can't figure it out. Any help would be appreciated

The code is:
P0171System too Lean (Bank 1)
Check for a vacuum leak.

Time for a new catalytic converter, most likely.

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