Hey John, if it was a vacuum line & it affected him going down the road, you should be able to hear it in May'retta.
Yeah it was a thought, my '93 Exploder has this problem some times, a vac line pops loose from the intake manifold and the thing feels like it's going to shake itself apart. I have learned with the PSD that you start looking at the "so obvious that couldn't be it" stuff first.
John