I have a 99 ford 5.4L Expy. Car won't fully go into park and will not start in neutral either. I have already replaced the shift linkage adjuster & the shift lever prior to this issue, since they were damaged. I have checked the shift linkage adjuster and the 2 shift bracket bolts (T30) knowing that they do come loose every now and then. Indicator reads park but, the vehicle still rolls on its own. When shifting into neutral and then attempting to start, nothing happens. Already tried to jump start while in neutral, still nothing. I have source voltage at starter and battery. I'm thinking it might be something mechanical. ANY SUGGESTIONS?