I'd probably be searching an air leak for the engine surge.

The TS Flasher issue will revolve around the combination relay which is in the back section of the fuse panel in the center. Large black relay with about 27 pins in two groups. It is probably 4-5inches long.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician