I have about 250k on my 4.2l it was throwing emission codes I replaced everything but the cats then it was throwing po420 and po430 ibelievesayung both cats r bad.now I'm stuck on thr side of the road truck is stumbling bad. I'm wondering if I blew engine. Low fuel light isn't on but I'm pretty low on fuel gonna try gas the a tow. Any ideas where to start looking ?

 

What did you end up finding was the problem?

 

That's strange. Those codes won't cause drivibility concerns UNLESS the cats are plugged. Both cats plugged or broke up and plugged that way at the same time isn't common. Could have a kinked exhaust somewhere or perhaps someone shoved a potato in the tail pipe. That's only IF the problem is indeed exhaust related.

Yea, sucks when users don't update their threads.

 

Yea yourycorrect . SorrySabout that it was the fuel pump. Couldn't hear on side of a busy intersection to listen for it to prime with key. Got towed back banged on the tank and it started working again. I changed it out with a new one all is well

 

Thanks for the update