Backfiring through air intake

Think it's the cat converters Already changed M.A.F and it still doesnt run right

 

You're getting a P0171 code? Failing cat converters throw a P0420 code, P0171 is usually a vacuum leak issue or something wrong with the MAF sensor

If you're positive you don't have any vacuum leaks I would try cleaning the MAF with actual MAF cleaner (not electrical cleaner or brake cleaner)

 

I changed the mass air flow sensor, still runs like crap.

 

What kind did you install? OEM or aftermarket? Aftermarket sensors are known to make these trucks run like crap, OEM/Denso sensors are the only way to go

Also beware of cheap OEM sensors online, lots of fakes coming from China

 

Vacuum or exhaust leak

 

Think it was duralast

 

You got some more background to the scenario? Are you asking for advice or just stating what you're doing next?
Were all of those codes showing when you had the ECU scanned?

 

Definitely pick up an OEM one. I would bet that Duralast one isn't doing you any good

 

Backfiring through the intake will be more than a vacuum or exhaust leak right? To me sounds like timing jumped or something with the ignition system with all those DTCs as well

 

Yes crusierguy asking for advice Had a guy scan my truck before and after I changed the mass airflow sensor. Still does the same thing

 

How many miles on it and what's the maintenance/repair history on it? And can you describe in a lil more detail the symptoms? Or describe what it's doing that it didn't do before?

 

173k. Before I changed the maf the tachometer was back and forth, once it fell below 500 it died When I tried to give it gas in park, the engine would sputter and could hear popping sounds coming from under the hood. When I got it to 35 mph it wouldnt go any faster. It had no power at all

 

In your first post with the picture, are those all codes that are currently showing? What maintenance has been done? Plugs and coil packs good? Timing belt and tensioner? At 173k miles there is quite a bit of maintenance that shouldve been done by now.
If you know you're timing belt and ignition stuff is all fine, a clogged cat could be a possibility.

 

The timing belt was replaced at 144k Not sure about the ignition situation .oil was changed ever 3k. Changed the plugs, wires and fuel filter just before last Christmas. Not sure about the coil packs either.

 

Okay, I'd think timing and ignition are okay if you've replaced those things you mention. That's a lot of codes you're ECU is throwing. Has the check engine lamp been on for a while before this?
An IR thermometer laser thingy could help you compare temps at inlet and outlet of the cats. Can you unbolt a cat and get a look and see how plugged it is? I'd definitely check for exhaust and vac leaks as well as someone mentioned earlier.

 

The check engine light wasnt on. And thanks I will check that out

 

Had this happen and it was a bad cat converter. Cut pipe in front of cat or unbolt if possible, should run better. Good luck and let us know what you find out.

 

Update: I tried everything I could think of and it didnt work. So I dropped it off at the mechanic. Just said f it

 

Bummer dude, sorry to hear that. Hopefully it's not too expensive of a fix. Keep us posted on it, hermano