[ckmaggie]

Parents came for turkey day visit. My father owns a '91 740 volvo. When warm, idle is dropping and almost stalling. If you accelerate quickly from a stop it stumbles but when you are very gentle on the pedal, it accelerates normally. At speed, car appears to run fine. When cold symptoms do not exist. Car is 4 cylinder fuel injected.

I am thinking vacuum leak. What is best way to check?

Any trouble shooting ideas appreciated. I can't find any info elsewhere and you guys are a great resource. And if I don't get this fixed soon, my parents may never leave....

Chris