I just bought a 90 4runner SR5 3.0 liter 5 speed manual 4x4 stock. I have noticed at times that when I am reducing speed by throttle and not down shifting or anything like that it seems to shudder, kind of like it would if your going to slow in to high of gear while accelerating. I am not sure what this could be. Kind of seems that maybe it needs a PVC valve or something like that but not sure. Not something that I have ever encountered before. Or could it be the throttle positioning sensor? I don't know any help would be most appreciated. Thanks.

 

Codes? The FSM (repair manual) is available from my signature to download, then go to:
"complete repair manual" and 3vz-e Engine: Mfi System: Diagnosis System. Follow the diagnosis steps and find your problem.

 

Motor shudders or whole vehicle? Might be rear dshaft u joints.

:wabbit2:

 

The check engine light does not come on. Its the whole vehicle and it does not do it all of the time just occasionally.

 

Check your u-joints on the drive shaft. also

 

I was thinking that was maybe the problem but was not sure.