OK, here's the problem. First let me just say that the 93 LT1 opti-spark was replaced about 15K miles ago, it has 125K on the motor, basically stock. Drives fine, but ignition system shuts down on me after 10-20 mins on the highway. 2200 rpm. Could it be...?

A) The ignition module is failing.
B) The Coil is going bad.
C) Bad opti-spark
D) Someone mentioned something about the fuel pump could be bad?

Please any feedback would help.

Thanks a lot.

Eric

 

Have you scanned if for codes? Since you have a 93, all you have to do is short the ALDL pins and flash the codes on the SES light. Courtesy of Shoebox:

http://shbox.com/1/dlc2.jpg

Then check the codes on Shoebox's code list, being careful to use the column on the far right, which has the codes that are specific to the 1993.

http://shbox.com/1/Dtcs.htm

No codes for the fuel pump, but that's simply a matter of checking the fuel pressure.