PO300 random miss only when hot

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Feb 3, 2026 | 9:10 PM

Worktruck01

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PO300 random miss only when hot

Changed wires, plugs, cap, rotor, check for vacuum leaks, intake manifolds, cleaned throttle body, cleaned mass air flow
Fuel pump isn't that old but went trough a couple.

Feb 3, 2026 | 9:14 PM

Rednucleus

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Joined: Jul 2014

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From: Marysville, WA

Hey Worktruck, welcome to Chevy. You need to add the details on your vehicle please

Feb 4, 2026 | 8:42 PM

Worktruck01

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Sorry 2001 chevy express 2500 5.7 gas I put the fuel gauge on it it was good. But hearing a tick on bank 2 not a valve tick like an arch tick. Plugs & wires 10,000 miles ago but not acdelcos

Feb 5, 2026 | 7:12 AM

Triaged

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Joined: Dec 2019

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Sometimes it's easiest to see high voltage electrical issues at night with the lights out, because you can see the "glowing purple ants" crawling all over where the problem is.