I replaced the MPFI system again have been testing it the last few months. I returned the standard ignition system back to oreillys and tried one from the 1A auto brand. That seems to have fixed my issue from what I can tell. I’m not sure if that will fix your ICM issue however, that might be...
I've been battling a starting issue for almost two years with my 1998 K1500. I apologize for this being long winded but I will try to be a detailed as possible. It will start up perfect on a cold start and shows no signs of issues while driving. If it sits for 5 minutes, it will start up fine...