Hey, I have a 1992 Silverado Ext. 5.7 V8 and it's been sitting up for quite some time. It's been cranked every so often for the past few years, and one day it didn't turn over. The fuel filter and assembly was all rusted and eaten up so I replaced that, only to find out that the throttle body was not in the best shape. I put a rebuild kit on it and replaced the gaskets, regulator, and the spring, but now the injectors aren't spraying. Are they shot?? Or could there be anything else wrong?