03 sierra. just got engine back in after replacing rings ad bearings. itis getingspark, ful pulse and pressure starts and runs for just a couple seconds. it was tuned with hptuners and ran great before. i dont have any dtc's. no security light flashing. it comes on and then after the self test. any ideas. nothing was changed. I do have a question on the ground straps. the left head gets a ground strap from a stud on the firewall as well as a strap to the left v cover. and there is one ground from the engine harness going to the back of the right head, also the 2 on the left side one to block and one to head. i am thinking there might be one more that should go to the right head, but, cant find another eyelet or ground. any help would be great.