Wouldn't let me put the model but it's a 97 GMC Jimmy. 4.3. 6 cylinder vortech. 4wd. The issue is it died the other day. The dashboard gauges won't work. Stuck in park. Cranks but doesn't start. Battery and alternator are both good. Didn't have a spark. Installed new ignition coil and it started up but wouldn't start up after. Even replaced the ECM computer and still nothing. Also code scanner just says error over and over.
Thank you for writing in. The only way to determine what is wrong with the vehicle is continue with diagnostics like you have been doing. The OBD-II system needs to be checked for power. If it doesn't have power, work backwards through the circuit until you find the issue. This may also be the cause of your starting issues. Only further inspection will tell. Good luck!
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