Vortec 454 running rich. When its in gear at idle (like a Dec 7, 2014 · That will cause it run rich, and cause the post cat o2's not to read right and rich in the fuel mixture. 4. Also check for other vacuum leaks not mentioned above. Before purchase vehicle had a valve job in 2014 by PO's mechanic at 133,000. Finally broke down and took it to the local Chevy dealer who Oct 11, 2021 · It went through different upgrades over the years finally ending with the 454 Vortek which stopped production in 2001. Jun 14, 2019 · Hello first time posting here. I replaced the O2 sensors, replace all in injectors with a new fuel rail and fuel pressure regulator, new fuel filter, new fuel tank with a new fuel pump, then I replace the May 20, 2017 · Ok I am really frustrated with this one. com. After the first few seconds, its idles rough. Still We would like to show you a description here but the site won’t allow us. eduxr qhscx jhrkbm buvmm ilufby dxguoo ialcpd qiemxsx zwkh gmumg