: Oil on sparkplugs??

03-05-06, 04:44 PM

I recently bought a 97 Seville STS with 56k miles. Car had a P0300 when i bought it and the SES light was on. It was also stuttering/backfireing on light/moderate acceleration. I replaced the plugs and wires and it is now running better. However the P0300 keeps coming back even after I cleared the PCM codes. When I changed the plugs I noticed that the front ones had oil on them. Would that be caused by a leaking valvecover gasket?


03-05-06, 05:11 PM
Yes, there are seals around the plug wells.