a little about my G. its a 2003 doggy door'd automatic sedan, just past 50K miles, bone stock.

like the title says, there are times when the G feels sluggish (through all gears) then there are times when its very responsive and rocket like. i'd say the sluggishness happens 2-3 days out of the week. and theres no consistency.

so what would you guys suggest?

 

i say your surrounding has a lot to do with it, weather too, if u drive at night when there's not much cars on the road the air is cleaner and the car feels faster, if u get stuck in traffic during the day the car will feel sluggish, because its inhaling everyone else's exhaust fumes, its always like that with every car, weather wise, when the rain washes away the pollution most cars perform better that's what i've noticed, i get the best performance when the sun is shining but its actually a bit cold outside, that type a day i noticed makes a big difference in performance

 

good gas & crappy gas, happens all the time.

 

i put only 91 octane so that cant be it. anyone else?

 

there are number of things that can cause this.
Ur surrounding areas have a lot to do with it/ elevation changes/temps have a lot of impact on the car. I personally notice when the car goes 1000 above where i live.
The other issue is the gas station that u get ur fuel from. After the first year 98% of the time i have been filling up in 1 gas station. The other 2% i always notice a difference in the car's acceleration or at least how it "feels".