Need Some Help.

[lil Scriv]

I've got a 2004 Suburban with a 5.3 and about 120k miles on it with a Diablo Predator programer on it, I was driving the Truck on the interstate and it started driving real rough like it had a miss, I pulled off the road into a parking lot and it wouldn't idel, I pulled the codes P0131 and p0151 any idea why it would be doing this?

[DofD]

There could be a number of reasons for the codes and issues.

- Bad O2 sensors

- Bad MAP sensor

- Bad MAF sensor

- Bad TPS sensor

- Vacuum leak

- Low fuel pressue

- Bad EGR valve

- Low battery voltage

[suzuki-guy]

yeah could be all of those things but would get generally worse wouldnt just do it all the sudden could be bad gas. anyone put sugar in your tank lol. but here are some things to try hook vaccuum pump to egr vale while tunning if you apply vaccuum and it almost stalls egr good if it doesent effect it egr is bad, check voltage on map sensor, idle control motor, while truck is running unplug o2 sensor if it runs worse o2 is ok if not it is bad, put fuel pressure gauge on one of the fuel lines turn it off if it chnages after five minuts cloggend or cracked line, if fuel pressure goes back and fourth bad fuel pressure regulator, one last thing after running for a while look at exhaust if it orange the clogged catylic convertor hope this helps

[lil Scriv]

Well after getting it home it was still running bad. Started it about 5-10 mins after I got home and it's Running fine like you flipped a switch. I Still am going to change the O2 sensors Spark plugs and Fuel filter(witch I was already planning on doing). Makes me wonder why it would just start running right like this.