I am experiencing some issues with my truck when i’m driving down the road. When I have accelerated and then start to maintain the speed I can hear my truck sound like its speeding up/slowing down, and I noticed on the RPMs that it fluctuates slightly when it does this, not a major increase in RPMs just enough to notice that it is moving. It doesn’t seem to be doing this after a while of driving as well.
It almost sounds like a vacuum leak but I don’t think there is one.
I had just replaced the catalytic converter on the driver side and that code went away, and Catalyst Efficency Below Threshold I believe Bank 2 popped up. There is also no misfire codes I have changed plug wires/plugs. I used a infrared thermometer to see if there was a difference in temperature before and after cat, but I didn’t see much of a difference in the temperatures.
Truck had a new spider injector put in, and I don’t know if fuel filter has been changed or not.
Can anyone provide me with a reason why it could be doing this, and how to fix it?
