Super slow acceleration and shakes. And muffle is loud.

Hi,
Lots of questions, slow down a bit and type up a chronological list, from when things went wrong, a neat #1-15 (example)
reflecting what the issues you first noticed were, your method(s) of remedying the day pissues were used, what parts you may have bought to to correct thing, parts you used to attempt repair. Very important, What CPU codes have showed up? The more specific the questions are, the less vague the
responses will be.
What year is your car, is it a stock Mustang GT, have aftermarket modifications, if so- are they? Was it running great, then one day- poorly? Or slightly worse over time, what was the first issue?
A picture is worth a thousand words, post a few so it’s easier on this end to see something with text, so questions can be asked.
Post-a few engine compartment pictures. If you decide to send a video of how it’s running at some point, post a clip, upload video to youtube, send the link here
From what I understand so far, something’sEggid it physically break, or just cease operating?
2) Car is running poorly, until the issue is found, I’d not push it, things can get much worse.
3) What work have you done to the car, did you do it to correct an issue, or upgrading things for higher power output? Why replace (2) Oxygen sensors, did you pull the EEC’s codes, jot them down, reset codes? Does the CEL flash while you are accelerating? Do you own, or have access to a decent Scantool? If not, I can suggest a cheaply priced one that allow advanced testing. Own a PC based laptop Computer
4)Np