Ask a Mechanic Online and Get Answers to Your Car Questions
The most common cause for ignition module failure on these GM engines is overheating, which can be the result of poor mounting insulation, an overcharging alternator putting out excessive voltage, or high engine compartment temperatures.
Make sure there is sufficient thermal grease between the module and the distributor body.
Check ignition primary circuit voltage at the Black/White wire on the module's two-wire connector - should be the same as charging system voltage and stay at an average 13 to 14 volts.
Some folks have customized the wiring in order to be able to relocate the modules away from engine heat; others have installed external fans.
Please let me know if you need further assistance with this issue.