Followed the directions on the manual code reader page, got a code 43, which is low voltage at electronic spark timing circuit, what does this mean exactly? My 94 chevrolet full size 4.3 also threw this code today, can anyone help?

 

good luck iv got a code 42 est circuit and have been trying to figure it out for 2 months iv changed the ignition module computer and have done every test in the book and still nothing iv posted on this board and no one responds i hope you have better luck .