Lean code on bank 1 and bank 2?

You will get lean codes with the engine misfiring; did you clear the codes after the tune up? Also, how did the spark plugs look? This engine has a fuel pressure regulator which I would remove the vacuum line from, if gas is present the regulator is bad, here is the location so you can check it out.

Even though you have a new fuel pump it could be defective. I would do a pressure test by following this guide.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

You can rent the gauge at the auto parts store for cheap or free. If you have low fuel pressure you will smell gas when the engine is hard starting.

Measure with the Key On Engine Off with the fuel pump commanded ON.

Vin (V,T,U)
Fuel Pressure (gasoline) .................... 55-62 psi

Vin (Z)
Fuel Pressure (ethanol) .................... 48-54 psi

These specifications are taken from the Fuel System Diagnosis. For complete testing of fuel pressures and volume see Fuel System Diagnosis, See: Computers and Control Systems > Testing and Inspection

This guide can help as well

https://www.2carpros.com/articles/repair-lean-mixture-codes-p0171-or-p0174-on-some-manufacturers

Check out the images (below). Let us know how it goes.

This engine does not use the spider fuel injector? Please look at the image I posted. With these numbers you could have a vacuum leak. I would use a smoke machine to check for a leak.

This injector is for the v6 engine. Can you confirm the engine size?

That sound can be caused by low compression. But the fuel pressure regulator can still be bad, which they are known for in these engines. Here is how you check the 4.3-liter engine. Check out the images (below). Let us know how it goes.