I HAVE A 2000 SEVILLE STS STARTED CAR NO ISSUES ...

2000 Cadillac Seville

Tiny

cnkw1205

December, 19, 2012 AT 10:57 PM

I have a 2000 seville sts, started car no issues, drove to store 15-20 minutes, got back in started car and ck eng light flashing.
proceeded to pull over turn off and restart, still flashing.
Drove 25-30 minutes at highway speed, light went off then back on. Now idle is rough.
Scanned at a-zone, po306 came up.
changed plugs and boots, actually seems worse,
Can anyone give me some diagnostic steps other than parts replacement, in order to fix this.

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