Okie dokie.i'll try that

 

My truck still backfires and now is having problems going up hills,what would b the next thing to tackle O2 sensors

 

Verify you have the firing order correct. (I checked mine three times before I finally got it right. Working back in there is just a pain.)

If that doesn't help, simply unplug the front O2 sensor, and go for a drive. If it runs better, replace the sensor.

If that doesn't help, physically remove the front O2 sensor from the exhaust, and go for a drive. See how it acts.

 

Oh i did the triple check on the wires,i figured it's the sensors

 

Unplug 'em and see.

 

Ok i'll try that.ty ty

 

Would upping to 89 octane help,i have almost 300,000 miles on it

 

Nope. I rather doubt its an octane issue. Low fuel pressure maybe..... or clogged cat...

 

I was thinking a goofy fuel line,i put another new fuel pump in 2 weeks ago.i had a supposedly new one in 2 months ago and that went out.i'm going to get the OEM O2 sensors.

 

NTK or Denso Sensors please. Both work good. You can get 'em cheap on Rock Auto.