Ok I have a 98 k1500 5.0 305 V8 truck that up until a few days ago ran great but then it started miss firing so i parked it till i got cash for a tune up i when to start it and it wouldnt fire up so I did the tune up to it today and it didn't help it still won't start just dose this really weird thing where u can hear it trying to fire but like there isn't a spark but I checked it and I have spark like I need just won't fire the fuel pump is turning on and there is pressure and I can't think of anything ells to do and know one I know has a clue please help me and yes it is a factory chevy 5.0