Plugged in a SCT SF3 tuner, now car will not start. 1999 V6. Car cranks, but won't start. When car is in the on, not running, position, the fan turns on. When cranking, the power brakes engage. Started PERFECTLY fine before. I tried pluggint the tuner back in to put it back into "stock" mode, but when I try that, the tuner reads "no vehicle detected". I don't know what to do. Please help ASAP.