[DaveNP]

From my personal experience my instinctive response is the much debated Lawn Mower Syndrome, which gets its name from cases where people have a car which runs fine on Friday coming home from work but won't fire up on Monday to go to work, when the situation is dissected it comes out that it was OK Friday, and oh I moved it out of the garage on Sunday to get to the lawn mower. Volvo 850 and V70 engines often don't like being started and stopped almost straight away there's a long debate on why but for the moment I'd suggest if it will start either let it run until the engine is thoroughly hot and/or take it for a long run, Let it go cold then see what it does, but if you start it make sure it gets up to temperature before you stop it.