Hi Joecar

Maybe I should add some more information. My car is a -68 Firebird with a engine swap to a 2002 LQ9 engine. The PCM is a LS1B, 512 kb unit. The main things that was done during the tuning were update of VE-table, spark-table and some changes in around the idle parameters. The tuner observed that the MAF-sensor was placed to close to a 90 degree turn so it did not work well. Therefore it was turned off by him.

There are no alarm connected and I have not tested what happens when the flash scan unit is connected. I can test this.

My headline is some what misleading, all four time when the car has stopped the ca was standing still, no speed. It has happen in traffic jam, at the stop sign or when the car was warming up in the garage.
It feels like it is some kind of fuel cut-off parameter that kicks in.

Thanks in advance and I appreciate any information that helps my where to start searching.

Magnus