Originally Posted by ryand73
When I changed the o2 sensors It changed froma rough idle to a smooth idle but now when im driving it will misfire and seem to lose power when I let off the gas sorry should of mentioned that last night no I did not use the denso o2 sensors ngk
I know it sounds petty, but it isn't - the o2 sensors must be Denso.
I went through three o2 sensors before I finally broke down and bought Denso's. It cost me a lot of headache, and money, troubleshooting the problem, while ignoring the advice I received about the sensors needing to be Denso.
Until you change the sensors for Denso's, you're just pissing into the wind trying to troubleshoot this.
There are only a few things that can be wrong (pending plugs/wires/cap are all in good condition): cam position sensor, crank position sensor, fuel sync, coil, 02 sensors, fuel pressure (pump).
If the crank position sensor is bad, the truck won't start.
If the fuel snyc is out of wack, the truck will sputter and backfire. This only would be bad if you loosened the distributor and started rotating it.
If the cam position sensor is bad, it should run like crap all the time.
If you have low fuel pressure, the truck will fall on it's face and run poorly (have you checked your fuel pressure?).
If the o2 sensors are bad, you'll get symptoms as you describe.
I can't promise 100-pct confidence that is your issue without seeing/driving your truck, but I'd be 80-pct (or better) confident it is.