ok ur jerking happens when ur car is under load but ur revs are relatively low for the speed...
like example u drive on 3rd at low speed where its more likely to have 2nd or car is on overdrive where its more suitable to have overdrive off.... well it s what for me...


but again i got crap idle so i think they both related as started bout same time....


well physically check O2 sensor.... i remember that mine did not want to clear too but then just did

i was getting check engine after 10-20 minutes of drive for 20-30 seconds or something like that for a whole month...
then everything just became to be ok... so i guess give it some time but start looking for the root of evil
neva replace things unless u r sure they cause problems
well unless u r rich