P CODES (POWERTRAIN) P0300 - P0399

Truck Is Running Lean, But Drives Good. Starts Acting Up When I Am Going Slow And In Idle But Not All The Time. I Have Replaced Fuel Tank...

Ok I Started With The Basics, Fuel Is A Solid 55-60 Even Under Load Driving. I Diagnosed The Ignition Module As Bad (had It Tested) Failed...

Engine Performance Problem 2004 Chevy Malibu 4 Cyl Automatic 78,000 Miles I Changed The Spark Plugs And I Still Am Getting The Misfire...

Just Replaced Head And Did Complete Tune Up And Don"t Know Where To Go Next? Car Has Random Misfires On Idle Updated 2-5-09 Already Did...

My Auto Has Engine Lite On And Has Po300 Code I Need To Check The Fuel Pressure But Dont See The Check Valve To Hook Up To It. Also I...

I Have A 3.4l Chevy Engine With A Multiple Miss Fire, That I Have Been Trying To Fix For The Last Two Years And I Am At A Dead End Or I'm...

I Did A Headgasket Replacement About A Year Ago On This Car. Everything Else Runs Fine No Overheating, And At Speeds Over 10mph The Car Runs...

My 1999 Jimmy Is Giving A Po 300 Code It Runs Very Rough. Has New Cap And Rotor, The Plugs And Wires Are Less Than A Year Old. Used A Cigar...

My Truck Shuts Off When At Low Rpm. I Got The Code P0300 What Does This Mean

Misfire, Check Engine Light.