One of the bulbs is failing at times or yes one socket is losing a ground. When it is going fast you should see a difference in one of the lights.When it is doing it put on the 4 ways and compare all the lights. The flasher goes fast when there is less current draw.Must have three bulbs ( one front and two rear) working correctly to flash normal.
73TORINO SPORT 112K M. BOUGHT NEW
04 DTR 42K M.
03 BLK 9K M.
07 GT500 10K M.
98 MARK VIII 70K M. BOUGHT NEW
21 EXPLORER PLATINUM 3.0
18 GENESIS G80 5.0
78 RANCHERO 5.0
54 GMC