Misfire on 3.8 V6 GM.

What is your question?

After spend absolutely to much money on this repair. Replaced ,wires,plugs,fuel injectors coils (6). Just replaced ignition control module,with no luck. Can the map sensor cause this misfire. Ck the PVC it was working. My scanner which is decent. We took this car to tires plus $750.00 and my g/f picked it up. Same symptoms. This car has ran flawless for years. This was a sudden fall off of performance. No internal engine noises. This is on a 04 3.8 Buick Park Ave. If someone has any ideas, please help. .

What makes this problem better or worse?

Makes no difference.