I have code p0300 and code p0496 2004 suburban 8.1L
P0300 Random misfire
P0496 EVAP emission high purge flow fault
Having a random misfire do come from false air such as vacuum leaks,low fuel pressure or excessive back pressure,But with P0496 this can cause random misfire check and inspect the purge line for proper hose connection. The open purge flow may be the cause of random misfire
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