Ok guys so i have a 04 Saab 9-5 Arc Im having issues with the car it is severally down on power. It started when i switched over fuel brands I always used Chevron 91 octane in my car ran perfect was happy with it . I decided to try Shell V Power Nitro. So i put in about 4 gallons or so just to see. It drove home fine boosted well. Took to work later on that night drove fine up until i put it into sport mode and gave it some gas misfired terribly and almost died. I manged to get home in the morning. I've been working on it ever since. My battery died it was not not getting charged so i replaced the alternator and battery. I checked the fuel filter it was clean enough nothing clogging it up. The fuel pump seems to be working it does have a kind erratic suction but car does start. I changed the plugs. I have 0 codes showing. Currently the car does start and move but any time i get on it and try to pick up speed it will hesitate bog out and die. Also at times at has trouble staying on. No idea what's wrong with it. Crankshaft positioning sensor was already replace i even warranty it just in case it was bad and still have the same issue. Order a replacement DIC thinking that may help.