Chevrolet Lumina Engine Idle Rough

The Lumina, Rough Idle, With Code P0021, P0018, Can You Define These Two Codes

1999 Chevy Lumina Mileage: 110,000. When Starting Engine, Car Cold (overnight For Example Regardless Of Outside Temp 20-60 Degrees) The...

Engine Performance Problem 1999 Chevy Lumina 6 Cyl It All Happened One Day When I Started The Engine In The Morning And Noticed A...

Occasionally When I Start The Car It Will Run Rough Like It Isn't Getting Gas But Flooding The Engine At The Same Time. Had A Tune Up...

My Car Was Running Just Fine Until One Day It Stopped Running. Then When I Restarted It It Was Running Really Really Rough And Has No Power...

My '98 Lumina 3.1l Has 120,000 But Was Running Good, Has Always Had Basic Up Keep (plugs, Oil Changes Etc.) But Never Anything Like New...

Only On Start Up And If Car Is Shut Off For 5 Min.or Longer The Engine Runs Really Rough And Loopes When Started.but Once It Quites Going...

My Car Has The 3.1 6 Cylinder. It's Worse When It's Cold, But After I Drive It For A While It Seems To Get Better. I Have Replaced The Fuel...

My 97 Lumina Starts But Runs Rough Then Stalls. I Replaced The Air Filter, And Checked All Fluid Levels. What Should I Check Next?

Car Was Idling Then Started To Be Rough So I Shut It Off. A Few Minutes Later When Went To Restart Started Just Fine. Drove About An...