1998 tahoe won't start

When my tahoe set over the weekend, come monday morning it started hard after several tries, then it just wouldn't start. I have replaced the fuel pump, inline filter. I have also installed new plugs. I have plenty of fuel pressure, good spark at the distributor cap and at the plugs.
I'm lost at what else I can try. DOES anyone out there have some helpful suggestions or answers why it won't start. Help me.

Thanks

Tim Jameson