I am geting code 43 i searched forums to no evail i iknow it is Low voltage at electronic spark timing circuit but wtf does that mean?Thanks for the help

 

If it's on your 87 GTA, it may be the elec spark control module. See if you can find a place that can test it. Autozone maybe???
Check/clean connections.

My car used to give that code sometimes when it was really hot under the hood (i.e.Texas summer, A/C on, stuck in traffic). Haven't seen it since I upgraded the radiator a few months back.

 

yea mine only does it when it getts hot like when it hits 220

 

Obviously it's a cooling issue. I had that code for one day...than my car over heated and boiled over. Replaced the t-stat, rad and a few gaskets...never had the problem again.