Power delivery issues and poor fuel economy

[Chris GTO TT]

My Car has been doing this for about as long as I've owned it. The low RPM power delivery seems very poor and not linear to me. Between 2000 and 2750 rpm the car seems to load up and be very sluggish to respond to throttle inputs. I also seem to get a bit of a vibration in that RPM range as i accelerate through them. I've logged that rpm range and nothing seems out of the ordinary, no knock, timing looks fine (can't recall the numbers) etc.

Also along with this issue I've never had very good fuel mileage. The best I've ever recorded is 22mpg with it being mostly highway. Normally I average about 18-19mpg.

I've checked the timing belt and all timing marks line up.

[DocWalt]

Have you verified that the O2 sensors are behaving properly? Just recently, my rear O2 stopped doing full cycles and the ECU leaned the trims out nearly all the way and made the car drive exactly like you're saying. Sluggish in that range, and fine everywhere else.

[Chris GTO TT]

I suppose it couldn't hurt to replace both O2 sensors, but iirc they do cycle properly

Who sells plug and play O2's?

[DocWalt]

FWIW, mine looked like they cycled properly, but didn't. Hard to explain, lol.

Advance Auto does, if you want locally. I just recently bought some from Rock Auto, super cheap.

[TooFast4Radar]

I always go to OEM on those sensors. They might cost a little more, but you know they are right and they're plug-n-play.

[DocWalt]

Rock Auto sells the OEM sensors, which is why I went with them the second time around. Advance sells Bosch. Both plug and play.

[Chris GTO TT]

Isnt OE bosch anyways?

[DocWalt]

Pretty sure it's Denso.

[Chris GTO TT]

yeah found the denso ones on amazon for 96.46 gunna order em.

[DocWalt]

I just paid under $50 for one from rock auto...