Hi guys just throwing this out to see some ideas. Just got my 408 fired up with the stock injectors but when I put the Ford racing 39lb injectors in it won't start just crank. I do have a tune loaded in to accommodate for the 39's. I guess I would be looking on advice on how to test the injectors.... I did purch8them used but we're supposedly working when upgraded to new ones......"damn ford parts"