my moms having trouble with her blazer she'll start it up and leave a parking and the car will cut out like all the idiot lights will come one the radio will cut out for a second. the car wont stall thought just all the lights ob the speedo (idiot lights) will come one. i took it to shucks and they said the ecm is not responding and i took it to autozone to see if any pending codes they said it passed. i cleaned the battery cables and checked the fuse. has anyone had this problem before.

 

well i took the alternator and battery out and they all passed at auto zone. i ckeaned the terminals better i drove it nothing happned since. it a;ways does it right after we start it and take off the engine will cutt out then be back on all the idiot lights come one as if the car just started up. im looking on checking the connections on the pcm maybe the plug is loose im not sure. if anyone has anything they know i can check let me know thanks.