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2000 , 1997, & 1992 Devilles
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Hello, recently purcased 2000 deville northstar engine. I am getting code PO300 engine misfires. I have checked and replaced the plugs, have no vacuum leaks. Checked the EGR valve. No clogs in the catalic converter, no leaks. I suspect that it may be related the the ignition module or the coil, but I am not sure. Need advice or expertise please.

Thanks
 

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99 Seville STS, 08 STS4 N* 1SG F55
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3,516 Posts
Possibly a bad coil pack or plug coil - I don't know when Cadillac switched over from packs to coil-on-plug. Were any of the plugs fouled when you pulled them?
 
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