well before I put the Reatta away for the winter, I was driving it and so weird things started happening

I would be driving around 30-50 mph and just cruising hardly touching the gas maybe coasting.

there would be a pulsing prrrrrr noise heard out of the exhaust (2.5 no cat dual exhaust)

prrrrr"" then nothing" "prrrrr" "then nothing" until I get back on the gas.

the vacuum gauge twitches when this happens and a small twitch in the car (hardly noticeable).

the only thing I can think of is a bad wire maybe?

Wow..could be tons of stuff.

One of the latest I've seen are bad coils. Worth checking them with an ohm meter and looking for vacuum leaks.

pretty sure the vacuum lines are ok. I will check the coil packs