Thread: Horrible misfire under heavy load: P0300, and P0171

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  1. #1 Horrible misfire under heavy load: P0300, and P0171 
    Rather B Blown
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    Default 02-13-2010
    Ok so for the past week or so, if i put my foot in her WOT, from about 4k rpm to redline, the car just starts bucking and shaking and flashing misfire codes at me. Got it scanned today and i got a P0300 random misfire and a P0171 System too lean Bank 1. I've looked for vacuum leaks and couldn't find any. Please help this is pissing me off thanks
    Quote Originally Posted by Reptile
    It sounds like you accidentally stuffed a midget in the downpipe, and he's hammering out an SOS to get out.
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  2. #2 Re: Horrible misfire under heavy load: P0300, and P0171 
    blueguy
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    Default 02-13-2010
    Rubber "T"s...check them.
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
    '99 Chevrolet Silverado Classic Z71 4x4 - K&N Intake/Gibson Exhaust #TRUCKTHINGS
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