So my blazer would stutter whenever my RPM went over 3000, and after running it for about an hour it would mysteriously just shut off no matter if i as on the expressay or in my driveway. It would just shutoff, but would crank up right away. So i searched around and found some of you guys saying to replace the ICM and the coil, that after a while they would lose spark or something. I found the ICM and coil together on ebay for 4.25 plus 8 dls shipping. I got it in the mail today and changed them out. big difference!!!!! no problems in the higher RPM's. I recommend this fix if you have the same symptoms.

 

Glad you got it fixed.

Just for others with these symptoms, you can have both of these devices tested at most autoparts stores.