u/KDgeEm

I got a 08 yaris base hatch with 250k it doesnt happen all the time but sometimes it feels like it has a delayed shift for 3rd gear...i checked the transmission fluid and the level is correct but the color is dark dont know if it has ever been changed...do you think thats the issue...should i do a full flush, a drain and fill, or just leave it alone or could the issue be something else any info is appreciated thanks