98 astro no start

Drove the van home from work wed. woke up thurs. a.m. cranks but wont start. Changed fuel filter pump seems to be working, tried a little starting fluid would not even fire. Checked one plug with voltage tester and that on was firing.

Check for blue, not orange, spark at more than one plug. Distributor cap and rotor are common problems. Check fuel pressure and leakdown rate. Post your results.