Misfire, problem should be attended to asap.
From Service CD:
Misfire type A:
Upon detection of a Misfire type A (200 revolutions) which would cause catalyst damage, the MIL will blink once per second during the actual misfire, and a DTC will be stored.
Misfire type B:
Upon detection of a Misfire type B (1000 revolutions) which will exceed the emissions threshold or cause a vehicle to fail an inspection and maintenance tailpipe emissions test, the MIL will illuminate and a DTC will be stored.
The DTC associated with multiple cylinder misfire for a Type A or Type B misfire is DTC P0300.
The DTCs associated with an individual cylinder misfire for a Type A or Type B misfire are DTCs P0301, P0302, P0303,
P0304, P0305, P0306, P0307, P0308, P0309 and P0310.
Note:
MIL = Malfunction Indicator Light = CEL
DTC = Diagnostic Trouble Code = CEL code
