My 98 Chevy 3500 manual finally has no spark

Hello, you'll have to troubleshoot the ignition system further, if in fact that's the source of the issue. The ignition system consists of the following components: -Vehicle Control Module (VCM). - Distributor. - Ignition Coil Driver Module. - Ignition Coil. - Crankshaft Position Sensor. Diagnostic testing must be performed evaluating the system components and wiring. The other thing to look at is the immobilizer - is there a properly programmed key being used? You did not mention if you have the 5.7L or 7.4L V8. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops