Originally Posted by lightthemup
Did you do a compression test?
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We have not done a compression test. Main reason being as the miss does come and go and isn't constant.
One thing I did do today seafoam it. I sucked roughly about a third of the can through the brake booster line. By the time I got the seafoam sucked it the exhaust was already starting to smoke and could already smell carbon burn off. My father in law is all but convinced of it being a carbon issue, and I'm just looking at all possibilities.
Another thing, I've noticed it more when motor is cold. I was thinking back to when I changed the plugs when I plugged 5 and 6 out the threads were oil soaked, but not the spark plug wells. I asked my father in law about it and he said these were pretty common for valve cover gasket failure and that someone probably changed it and not the plugs and to keep a eye on it. I checked about 1k later and they were try. My question is what are my chances I have a COP boot acting up from age or since they have had oil on them? Or should I change them anyways? BTW the trailblazer has 96k miles on it and the plugs and one coil pack were changed at 87k drove till 95k and then the fuel injectors and intake gasket changed.