99 5.2

Starts and runs fine but if u let it idle for about a minute it starts to surge and eventually will die. The only code that pops up every once in awhile is bank 1 o2 voltage to high. It has a complete new exhaust system from new exhaust manifolds ,y pipe both o2 , all new pipe with a MagnaFlow cat back.

So I am pretty sure it's not a bad o2..

Any ideals

 

What brand O2's did you use? If Bosch, replace them with NGK or Denso.

Give the throttle body a good cleaning. Take it off to do it and make sure the IAC passages are clean.

 

up stream o2 sensor. will cause over loading which can deffently cause a rough idle and stall. high voltage is a ground issue normally the ground side issue is because the 02 is smoked. but all that side the ASD is also part of the upstream 02s may be something to look in to