2010 silverado LTZ rough idle, light flicker, and rattle

[Swilliamson91]

Hello!
So I recently bought a 2010 Chevy Silverado LTZ with 31,000 miles (5.3l engine). After having the truck a few days, I have noticed a couple of problems and I am looking for some help trying to figure out the cause.

1) I have noticed there is a rough idle in the passenger seat while the truck is in drive. Once the truck is started and driven about 5 minutes, once you come to a complete stop in drive (ex. stop light) a rough idle over takes the truck. You can feel this idle a lot more in the passenger seat than in the driver seat. The RPM gauge also fluctuates during the rattle.
2) At night my the headlights flicker randomly, on and off very quickly.
3) In the morning when I start the truck and drive it a bit, I hear a rattle which sounds like it is coming from the front right of the truck. Bumps do not trigger this rattle, which usually only lasts a couple seconds. I usually hear the rattle between 1,000 and 1,200 rpms.

I have taken the truck into the shop 2 times to get these items fixed, and they said they cannot feel a rough idle. If anyone else has experienced any of these problems please share how they were fixed. Thank you so much.

[j cAT]

what is the idle RPM ? POOR IDLE is usually a fuel mixture issue with no codes I would measure the fuel pressure. could be this has bad fuel injectors dirty damaged from old flood damaged fuel.

The TB throttle body and IAC will need be cleaned. this requires the removal of the IAC and the cleaning of its bore that it sits into ..

I would get a car fax report to check on the vehicles history.

being a 2010 5.3L AFM vehicle this is not a good buy many engine failures IMO a defective GM engine design..

DO NOT USE CHEAP ENGINE OIL !! ONLY DEXOS OIL SPEC !!