Hi Guys Been a while But glad to be back.

My 1986 560 SL, 160K Had her for 17 years always ran great Developed a bit of a rough start. Vacuum just off full left, will stumble a bit on acceleration.

If left to warmup for 5 min vacuum goes full left and has just a bit of hesitation going. Once going, she run as she should. Did a smoke test did not see anything.

But when i stop and park and come back out to restart, it may do the same thing again. Or worse if I don't let run a bit. After a while, 30 sec and then vacuum needle back to left. Plan to redo the smoke test, Where is the best insertion location for smoke. Pressure better than just blowing?

Also Want to do a vacuum test. Where is the best place to connect Vacuum Gauge?

Your thought appreciated.

Jack in CA