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If the light is on thats one thing, But when it flashes, thats bad. Have an autoparts store scan it,(it's free) You MUST address this problem at once if you don't it will cause damage to the vehicle. Check at nite, with engine runnind, for spark plug wire arcing out to ground
Yes it could but without further diagnosis it's difficult to be sure. Manufacturers suggest platunum spark plugs be replaced after 100,000 miles. If your close to this it would be a good idea to change them anyway. While spark plug wires can fail they don't normally wear out like spark plugs. They can very easily be checked with an ohm meter. I wouldn't replace them unless I found a problem with one or more of them.
The spark plugs are located normally near the value cover where you put in the oil. The wires run from the spark plugs. If your vehicle is a 4 cylinder then there will be 4 spark plugs. If it's a 6 cylinder there will be 6 spark plugs.
Visit www.trailvoy.com and do a search on "how to replace spark plugs", you will find threads describing the process. Make sure to use AC Delco Iridium 41-103 plugs.
look at the distributer and follow the spark plug wires from it out to each spark plug but each wire as u pull them. dont take all off at once . or u might not know how to hook them all back the right way.
could be a bad plug even know they are new one might be bad , first check in the dark for any arcing (blue sparks) coming from wires might be a split in one of the spark boots ,make sure on there good,also a chance you put wire to wrong cylinder
Timing chain usually does not cause a miss. It may run sluggish or even backfire, but a miss is like a spark plug with the wire off. Like a dead cylinder. Chevy timing chains do stretch but those engines can handle quite abit of timing. I had one with 120K miles and it was only off 4 degrees. That's nothing for chevy to handle. A tune up is usually nothing but a set of plugs and a hook up to a diagnostic machine. I would look deeper. Go out at night, start the engine with the hood open. Make sure you are in a very dark place. Look for sparks jumping from plug wire. Another way to to use a spray bottle of water. Spray a very fine mist of water around the wires. If they are bad, a spark will jump. Check cap for deposits. You can only hope that the plugs were gapped right.
Good luck
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