I just changed the oil today on the '00 Silverado 5.3. For the past month the OLM has been going off at start-up. I drained the oil, installed new filter, and started the truck and let idle then turned it off. After checking the dipstick, I turned the key to the on position and pumped the gas three times in 5 seconds like I always do. I start the truck and the OLM blinks. I must have repeated the reset sequence a 1/2 dozen times. The OLM will not reset! Your suggestions please.