I have a 93 940 Volvo non turbo. The car will run fine for a day or two and then start stalling at stop signs and loose power. We replaced the fuel filter and added some Sea Foam injector cleaner to the fuel. Ran great for a week then stared stalling and no power again. Any ideas? Greg

Optional Information:
1993 Volvo 940 4 cyl

Already Tried:
changing fuel filter and injector cleaner