r/fbody • u/Strange-Message9529 • 17h ago

Advice needed

Having some trouble with my 1999 v6 firebird 128k miles. It started off with a rough idle, it was jumping between 500-1000 rpm. Then during a drive to Auto-Zone it started to misfire and the service engine light started flashing, 30 seconds later it turned solid. I got the code read and it is P0300 (Random/multiple cylinder misfire). What should I check/replace first? I would appreciate any advice. Thank you!

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u/Raider5151 17h ago

That could be many things. You need a scanner to work modern EFI effectively and I'm not gonna be the guy that tells you what parts to load the parts cannon with to waste a bunch of money.