Computer resetting?
 

I have an 06 Nissan Sentra. 1.8L engine. I failed emissions test and code was P0455. Wasn’t the gas cap. Smoke test determined it was the evap vent solenoid. I had it replaced. The check engine light is off now and o drove for 50 miles to reset the computer. I drove for 20 miles and all seemed fine then the car started being sluggish. I would press the accelerator and it would take 3000 rpms to get to 30 mph. I tried to get to 40 and it went to 4000 rpms to hit 40. I really couldn’t get it past 45. I continued to drive it another 26 miles(46 total) and all of a sudden back to normal working fine. I drove it an additional 4 miles with no issues. Was the sluggishness just the computer resetting itself?