C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

93 missing soon after startup

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Old Aug 7, 2019 | 01:32 AM
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Default 93 missing soon after startup

Hey,

I’ve run into a weird issue with my car. The majority of the time it runs fine, but occasionally, and most frequently within a few minutes of startup, it misfires for a few seconds before returning to normal. This happens most often (or at least is most noticeable) when driving uphill. I’ve had intermittent EVAP issues—sometimes the car wants to fuel all the way and sometimes not, and I’ll occasionally catch a whiff of raw gas—but no codes. Any ideas?
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