I have a 2000 tahoe with the 5.3. when i slow down or turn it start running rough or ends up shutting down but then will start right back up if i put it into N and turn it over. would this be a fuel pump issue or a pressure regulator? Maye something else any input would be nice. thanks

 

I would try cleaning the idle air control valve, and a few bottles of Techron in the tank.... also inspect the intake for carbon build up

Open up the throttle plate and inspect the throttle body for carbon build up...

 

Welcome to the forum.

Also check your fuel pressure.

 

i foung the problem. i talked to a guy that was having the same problem and he said to replace the throttle positioning sensor. so when i took mine out it was broken and bamola problem fixed. But i do have alot of carbon build up in the intake what is a causing that, and what would be the best way about cleaning that out? Thanks for the input.

 

Carbon build-up downstream of the throttle plates on both carb and FI engines is caused by reversion.

 

so how do i fix that?

 

Reversion? you can't really fix, its part of how the engine works and develops power to an extent. (as I understand it, its the revers flow of exhaust fumes)

You can help slow it by using clean fuels (top tier) and fuel additives (Techron) that help reduce the build up, and good old regular maintenance (regular oil changes)

 

what is the best way to clean all of that carbon out really well without taking the intake off.

 

You really only need to remove the throttle body to get to the problematic carbon build up. The carbon builds up and causes the throttle plate to not fully close and you get too much air getting into the engine and it jacks the idle up...

The throttle body is pretty easy to remove, take off the snorkel of the air intake
disconnect the elec connection of the TPS throttle position sensor, I think its 2 or 4 10mm nuts that hold it on.
(and if you loose one and it gets lodged behind the water pump and no amount of digging gets it out, you can use the nut that holds the under hood lamp on and zip tie the wire back onto the stud) I'm just saying cause that certainly didn't happen to me...

 

thanks for the help.