91 3VZE stock configuration everywhere, Automatic trans. A few days ago the engine starting stumbling pretty bad when you give it gas, I first thought it was because it was cold, but then I noticed the temperature wasin the normal range as it had been idling a while. It has gotten worse and when starting across a street or something you don't know if it is going to fall on its face or go. I have been tionkering with it and notice that when I crack the throttle open a little while working under the hood, it starts to miss real bad just above idle. I fisrt thought throttle position sensor so I replaced that with a spare I had but it still does the same thing. If I open the throttle up alot, the engine will take off and run. It almost feels like it develops a real bad vacuum leak or something when you open the throttle, it almost dies sometimes. What gets me is that it will just sit there and run rough and not clear up when you hold it open a little.

Any thoughts? I have not had anything quite like this before. maybe distribuot/vaccum advance malfunction or module or????? This is actually on my 4 runner but same as my truck right...

Cheers!

Kris

Sounds like either an air leak or fuel pressure problem.