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my 2000 silverado 4.8 only has 9700 miles on it a few weeks ago i started it there was a miss like a bad plug /when i shut it off and restarted it it was fine. today the miss came back and service engine soon light came on i cheched plug wires into coil packs all look good no corrosion every thing is original on truck like i said only 9700 miles /truck was given to me last november with 8400 miles on it / is there anyway to check it without a scanner to read codes
 

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my 2000 silverado 4.8 only has 9700 miles on it a few weeks ago i started it there was a miss like a bad plug /when i shut it off and restarted it it was fine. today the miss came back and service engine soon light came on i cheched plug wires into coil packs all look good no corrosion every thing is original on truck like i said only 9700 miles /truck was given to me last november with 8400 miles on it / is there anyway to check it without a scanner to read codes
Your going to need to have the Computer Scan for the Trouble code or codes.....that are causing your SES light to go on and off.....Your local Parts House....Auto Zone O'Reilly's etc....do this service at no cost, make sure to get the what the Trouble code/codes are.

Edit:......From the 2004" Owners Manual when you have Flashing Light SES— A misfire condition has been detected. A misfire increases vehicle emissions and may damage the emission control system on your vehicle. Diagnosis and service may be required.
 

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My 2004 5.3 has started doing this same thing. I found my gas cap is not sealing properly all the time. When it starts running a little rough. I undo and reseal the cap. It will still run a little rough for a short time afterwards and the light will go out after starting the truck a couple of times. I am picking up a new cap this week.
 

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You will want to get the codes scanned that really is the only way to check. and with 9700 miles in that long of a time there is a good chance that some things are dry rotted, and or you have an injector problem from the fuel going bad etc.
 

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Discussion Starter #5
had it scanned bad 02 sensor found 175.00 dollars later and im good to go .i spent all day fixing a carberator on my friends old generator no problem im old school but dont have the equipment to fix m,y truck . just cant see myself paying 300.00 for a tool i will only use a few times .but its getting to that point ill have to make the investment
 

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I actually use one that was $70.. and it has done everything i have needed it to. Really you will just want one that can pull OBD2 codes, and most parts stores sell a cheaper version that will be more than what you will need.
 
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