[GentleBen]

I've had three instances over the past two weeks where, after sitting a red light for a long period, when I start moving (yes, with a green light) the engine quits for no discernible reason. No codes are sent to the DIC nor does my OBDII scanner report any set or pending codes.

It will immediately restart and either immediately quits requiring a second (or third) restart or continues to run with no further problem. It does not set any code that I can find and the most that shows is a few misfires (5 on plug 8, 1 each on plugs 7,6, and 5, with 0 misfires on all remaining plugs).

This has happened when (1 instance) the gas was a little below 1/4 filled and the last two times where the gas level was between 7/8ths and full tank. The air filter (K&N) was cleaned over two months ago and seems to be okay. Battery is a yellow top Optima and holds a consistent charge between 13.8 and 14.2 volts.

Anyone have an idea of what could be causing this?

ADDED: The car is a 2005 and it has a complete Lingenfelter 403 engine that has been in it for over five years with no problems before now, a one-year old Optima yellow top that consistently holds between 13.8 and 14.2 volts, K&N air filter that was cleaned over two months ago, and is a manual 6-speed Z51 vehicle.