Hi, I have a 2011 silverado with a 4.8 petrol engine. And the concern is that it turns on a few seconds and goes out. the detail is that at this moment I don't have a scanner. I would like the biggest suggestions you can give me to check the engine from head to toe. Today I was fixing it all day. I did a throttle cleaning, I checked the gas pump and had a broken hose replace it, I cleaned the spark plugs that were full of gasoline and finally the alarm I made a bridge and that was where I turned on 10 seconds and turned off again but then check the spark plugs again and they had gasoline again, I cleaned them, started again for 10 seconds with a fault and now nothing more starts but does not start.