Brief, Occasional Misfires P1310, P1315, P1320, P1325

[CodeReader]

1999 RX300, AWD, 186,000 km

Brief, occasional misfires resulting a one-time vehicle jerk and a blinking CEL that stays lit after about a minute. Codes vary, but are in the P1310-1325 range. These are single misfires, not continuous, in 2 or 4 cylinders. The events have happened 7 times between 2/21/09 and 7/10/09. Although sporadic, on the average, these events happen every 416 miles, twenty days apart. Yes, this is a strange, but, true story.

Neither the Toyota nor the Lexus repair shops have recall of similar problems.

Has this happened to you?

What is the cause?

What is the repair?

This is serious problem with which I need help.

Thank you