i think i have a miss when i start the car it vibrates and eventually smooths out as i rev it higher also the ses light has always stayed on but now it is flashing i changed the plugs and wires a few months ago its an lt1 that has about 95k and normally sees 6000rpm


thanks,

 

A flashing SES is usually freeze framing misfire info, you probably have P0300 random/multiple misfire, take it to an Advance Auto or Auto Zone and get it scanned for free.

 

make sure all your plugs and wires are tight...i was running high rpms in my bird and one of the spark wires came off. Couldn't see it until night and you could see the spark arcing to the block.

 

I took it to Advance, here are the codes: DTC PO300 Random multiple cylinder misfire, DTC PO420, DTC PO430 (catalyst efficiency below threshold bank 1 and 2) and, DTC P1509 idol control system high rpm. Any help would be appreciated, iam scared the opti may be going out. Thanks