The first thing that comes to mind would be to monitor the battery voltage as the engine is going through these cycles. If the voltage drops as the frequency valve is stopping and the goes up as the engine speeds up it would seem to be either a battery, connection, cable, or charging system problem. I would also watch the voltage on the lambda relay, maybe it is a sensitive or bad relay or just a dirty connection. I would think this is not a fuel system problem as much as it might be an electrical problem. Maybe even a bad alternater that can't put out enough at idle? If the freq valve was bad it wouldn't do this, it just wouldn't work at all. Check the plug going to it for a bad connection. Inspect the connections going to the idle motor too. David Teitelbaum vin 10757 --- In dmcnews@xxxx, "dmcman82" <srubano@xxxx> wrote: > Hello all, > I am experiencing a problem with my D that has me puzzled. I started > it up for the first time in 5 months and it started with no problem > at all. as the engine sat idling for a few minutes until it reached