My 90 coupe recently went in for service about a year ago, at which time a bunch of (not sure what all) rotted hoses were replaced. It's been running fine, but recently it's started to idle strange.

After the car is warmed up, I'll come to a stoplight, and with the clutch in and my foot off the gas, the revs will slowly climb to 12-1300. When it hits the top mark, it misfires its way down to about 7-800, then climbs again to 1300, misfires & drops, climbs, misfires, climbs, etc... Each up and down cycle takes about 5 seconds, so it's not a real rapid acceleration.

At a glance, I can't find anything loose. I've got to believe this is a vacuum issue, but I can't see it and I don't have gauges. Any idea on the best place to look?

 

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