My 97 850 has a very slight stumble as I accelerate from idle. I do not have a check engine light on. Engine runs perfect most of the time, uses no oil and gets very good mileage. This is a minor but annoying problem. Lots of people would not notice it, it's more like a half or one second delay when I try to take off from stopped. Once under way I have good acceleration, power is there immediately, there is no lag.

Plugs are fairly new, not sure about wires and rotor. Turbo was rebuilt 20,000 miles ago, when I did the head gasket.

This is the low pressure turbo so I do not have a boost gauge. But turbo has no issues as far as I can tell.

Sort of stumped and unsure how to proceed. Looking for suggestions. I do not think it is a tranny issue, more like a very brief lean condition. Maybe a vacuum leak? Maybe a turbo issue? Fuel injectors? Throttle body? MAF? Like I said. Stumped. :(

Counting on Klaus now ;)