95 mustang frictien noise

First of all did you have this noise before the PRs were replaced or only after they were replaced. If no problems before the PRs were replaced then they could be the problem. If so take it back to the shop and have them do a test drive, with you in the car with them of course, to repeat the condition. I highly suggest against touching anything that was worked on by someone else to avoid voiding the warranty, if any.

If the noise was there before the PRs were replaced then I suggest you check the car's timing to see what the initial timing is at - it maybe to high. You will find many topics in the search function on checking timing. Just search under "timing" or "set timing" or something to that affect.