whats gonna plug the exhaust? Carbon buildup? its only a year and a half old. How can i check the cat if it is so called "plugged"? Also i just bought new ntk o2sensors and mopar plugs, mopar rotor button, and mopor cap.

 

Remove the pre-cat O2 from the exhaust. You can unplug it, or not, up to you. (I would....) Take it for a drive. Run better? Cat is clogged.

 

If the cat is clogged, some of that honey comb can lodge itself in the intermediate pipe. Hence, clogged exhaust. When my cat went out on me, part of it got stuck in the tail pipe. Right above the axle where there's a hump in the pipe.

 

alright i did some expirementation. Pulled the front o2 sensor. drove the truck. couldnt get the check engine light to flash even tho it was already on. The truck drove fine but was trying to run rich cause i could smell it. Drove back home put o2 sensor back in. Let it cool then droveit again idle was fine and when i got on the gas sure enough i could get the check engine light to flash. came home changed the plugs, dist cap and rotor button, installed new ntk o2 sensors. Old plugs looked great but were all soaked in gasoline. put back in mopar champion plugs and the truck performs flawlessly. No missing at idle or underload. we will see how long it lasts. Also the old o2 sensors looked awful. full of black carbon and therefore i think they were fouling cause the engine to load up on fuel and miss. (hopefully)

 

Blown plenum will trash O2s, and cat over time. Have you dealt with that yet?

 

Plenum is still good.cat is clean. Truck is doing great. the o2 sensor change did the trick. Everyone thnks for the help

 

Pulling tohe O2 sensor will also cause it to run rich and may even dump enought fuel to wet plugs. Just saying....Hope problem is resolved, but if it comes back, I have to agree with cat issue.