2000 b4000

[sparkola]

I have an intermittent stuttering. Doesn't happen consistently. RPMs stay constant and it will go away as quickly as it came. Also I have noticed that I slow to respond precat drivers side O2 sensor. Works fine till it warms up then the volts eventually drop down to .01. 255000 miles all other parts up to spec and in tune. Any ideas?

 

[adsm08]

O2 sensors are 100K maint items.

When was the last tune up?

 

[sparkola]

Did plugs wires and fliters about 7000 miles ago. All plugs looked good. When it's stuttering i can stand on the gas and then its like it needs to clear its throat and then she's off. The drivers side O2 was just replaced after setting the code for not enough rich/lean threshold crossing. Beginning to wonder if its just another bad O2 or if I have a signal wiring problem. When the O2 starts to go nonexistent, you can see it drop by 1 hundreth volt till it hits the bottom. I also have a an ABS light on that throws the "low Battery Voltage" code or whetaver it is. Anyone know of all the grounding spots on that chassis? This is my 3rd set of O2's by the way. i also did the triple rubber gasket replacement in between the upper and lower intake manifolds. Come to think of it, i started noticing the stuttering a little bit after that.