I just got a greddy type s blow off valve and had my car dyno tuned. Now the car shuts off sometimes when I slow down and am going at very low speed. The RPM's seem to get below 1,000 RPM and then go to like 0 and the car turns off. Is this due to this blowoff valve or could it be from having my car tunned wrong in the idle range? Please give me some help guys, having your car shut off while driving and making turns is very dangerous. Thanks.