So you’re saying anywhere between 0-3000 rpm if you “get on it” its bogging down ??...if in 3rd and you do it it’s fine ??...where are your long term fuel trims sitting right now...just want to know if it’s been lean ??...does your Tech 2 show show MAF grams/second or voltage...look at that at idle and under load !!...my 01 is around 7 grams/sec at idle...should go up to around 190 grams/sec at WOT !!...both upstream O2’s should go RICH under acceleration !!

Rob

One Test Is Worth 1,000 “Expert” Opinions”

You have a Tech 2...a factory scan tool !!...you can see if you are in open or closed loop just by looking at live data...you'll be in open loop when 1) cold engine when first started, WOT, heavy accel and decell,...if you had a fixed O2 sensor either rich or lean that will force it into open loop AND you'll have a DTC. can't remember if there are any others. You should NOT be in closed loop during these conditions...Like I said I usually don't diagnose just based on symptoms...you gotta test !! ….like I said look at fuel trims, MAF PIDS, etc... You can disconnect the MAF and let it run off your MAP sensor...it will throw a DTC and run rough for a second or two after starting but you'll see if you have the same issues while driving like you have now. You said it "seems" like the O2 are working...do you know what the O2's are supposed to look like under various driving conditions ??...I'll include a link to O2's and fuel trim operation...you'll learn a lot !! ...look at part 2 about the 3:50 minute mark into the video...he explains MAF diagnosis with fuel trims !!...long term fuel trims are what most diagnose driveability issues with but some forum members may disagree...in the video we are looking at the LONG TERMS !!!

They are hot enough !!!...You'll have issues if the O2 heater circuit is inoperative after startup...you'll be in open loop then and stay there and a DTC will set...when the O2 sensors are warmed up you'll start to see the fuel trim numbers starting to move either positive or negative...your are now in closed loop...check that with your Tech 2...during idle operation the upstream O2 sensors will be switching between 200-800 millivolts or so...the down streams will be kind of steady somewhere around 450 millivolts....just remember....LEAN IS LOW (below 450 mv) and RICH IS HIGH (above 450mv)....if O2 around 200 it's lean...if 800 it's reporting rich !!

He probably should have gotten a misfire DTC...either P0300 or cylinder specific...without some testing you just don’t know !! :)).
With that Tech 2 OP just has to get some data together !!

You Tube

Just looked at my Autel...it doesn’t read MAF voltage..just airflow...ask a forum member who might have one...I think my man Froggy just bought one...I can tell you how to check it...with MAF unplugged you should have your 5 volt ref. on the yellow wire, 12 volt on the pink and ground on the black/white which is a body ground...G106 !!