[Westminster]

Last 5 weeks or so, 17 mile drive to work mostly intestate-80 mph speeds. Runs perfectly for morning drive. 17 miles back home afternoon, 80 mph speeds. The very 1st stop light I hit; the rpm's rev to 1100, then slowly return to 600. 5 lights to get home and engine continues to rev rest of way home. Does not, run perfectly...
Salt Lake temperature of course a little cooler in the AM this time of year, but the afternoon temp isn't a huge change (maybe 10-15 degrees most days)
Data-
Purchased with 30,000, now 72,000
Service light comes on for 50-70 miles, then off for 50-70 miles
Codes- P1006, P2096
I pulled out and cleaned the VALNOS solenoids (they looked bran new to me)
With this pattern, would you assume I need to tackle the Eccentric sensor? Or is there something else going on?