My 1991 Volvo 740 Sedan with 130,000 miles stalls at any given time. But usually when the engine is warmed up. A month ago I had the fuel pressure checked & it was normal. I recently thought it was the electrical system having a problem, after having that system checked, I found it had a bad cell in the battery and had it replaced. But still, driving down the road at any speed or even at a stand still it stalls out. Sometimes it will run up to 3 weeks without stalling and sometimes it will stall 5 to 6 times a day. After turning the ignition off, then back on, it will usually start right back up and go but not always. Sometime have to let it set awhile and 5 or 6 tries later will start. Last time it stalled, I checked for codes and there were none. Would appreciate any help I can get. Thanks, Pat