95 k1500 5.7 slight rough idle while stopped

[Kylebg94]

So since I've owned this truck. Now 5k miles and around 8 months. I've had a rough idle when stopped. Wether I've been driving it for awhile or not. Not in the beginning I replaced things that were obviously in need of replacing. I have replaced a fuel filter, because it was clogged, I have put a brand new air filter in because the old one was fairly dirty. I replaced the pcv valve and hose. Because I noticed the hose was cracked. And the valve was replaced because of preventive maintenance. I also put brand new spark plugs in, the ones in the truck were fairly old. They showed signs of some carbon build up as well. I guess that's to be expected at 207k when I changed them. Any ideas what could be causing the rough idle? Thanks in advance.

 

[Schurkey]

Verify ALL tune-up parts and procedures: Cap, rotor, plug wires, plugs, PCV, EGR, charcoal canister/evap system, initial timing and electronic spark advance.

Check for vacuum leaks at the intake manifold gaskets, and TBI gaskets.

Verify fuel pressure at prime and under load.

Connect a scan tool, check EVERY sensor and computer output. Look at the fuel trims. And you'll very likely need an O2 sensor.

 

[sneakingfart]

Honestly, these trucks don't really idle smoothly. What you're describing as a "slight rough idle" may be completely normal. Mine has some slight but noticeable vibrations and idle speed variations when stopped. Despite what people think, V8 engines aren't inherently smooth.