Change your spark plugs!!

[Jared Jackson]

Just bought a 99 Chevy Z71 and was experiencing hesitation under load and shaking violently. Checked the wires and plugs and they definitely needed to be replaced. A spark plug thread had broken off inside the engine head and the spark plug separated. Had to use an EZ out to get the threading out but what a pain in the ass. Also the elecrrodes on all the plugs I pulled we're burnt down into the plastic part of the plug I'm really surprised this truck even ran! he Peo you need to change your plugs or check them more frequently than 5 years lol

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[454cid]

Weird.. That is the specified plug for the GMPP 330 HP 350 HO, the SPO 357 HP 350 and the Ramjet engines.

I was actually looking at plugs for a 454 so maybe that had something to do with it. It's still strange that they would be ok for one application, and not the other.