92 Bonneville Service Engine Light

My 92 Boneville has intermittent service engine light. The code on the troubleshooting chart is 42 and referenced as a ignition control unit. The light
only comes on when the car is hot and does not conicide with any performance issues. Any suggestions?

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.