motor mount.
Back in 2011, I bought a 98 base that needed some love. One item of note was a bit of a rough idle. After changing plugs and filters, along with cleaning the MAF, I felt no difference. One day while at a light, I noticed that although I still had a rough idle, the tach was rock steady. I replaced the mount and the car felt like new. Worth a shot as I'll bet your buddy may have not yet replaced his yet.
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