I just swapped my 2jzge on my gs300 and it was working fine and good until it stopped on me on the freeway and turned off. It turns on and it runs for about 5 secs but then shuts down. I can out it into drive and reverse and t works but it'll turn off. They told me it was more than likely the fuel pump but since I just got a swap I'm not too sure. Any advice and help is appreciated.