I'd check the plug gaps, I pulled the OEM plugs in my '99 Yuk at 65k and
found the gaps running from .055 to .065 . Wonder what the .055 plug was
gapped at when it was installed at the factory? Only about half where even
close, double plats don't wear that much and don't close up when wearing
Idles smooth now with properly gapped plugs.
The dealer isn't gonna pull plugs and check them unless ones completely
dead and misfiring. Ya probably got the same plug installer on your truck
as I had on mine.
"Anything you say can & will be misquoted & used against you"
I had a similar problem with my K2500. I came to this newsgroup for an
answer to this problem about 2 years ago and this is the answer I received
from a "Dean Dardwin" and it solved my problem.
"This is very common. I'll bet there is MTBE and/or ethyl alcohol in your
gas, right? They fouled your injectors. Try running a tank with Chevron's
TECHRON Fuel Injector Cleaner and see if it doesn't improve. Don't
have to run some about every 10th tank or so."
Therefore, I filled the gas tank with Chevron premium gas and added a bottle
of Chevron's TECHRON Fuel Injector Cleaner to the gas tank and after about
100 miles the problem went away. A couple of months later, I actually
caught my wife using other cheaper brands (against my instructions) when I
noticed it happening again. I just added a bottle of Chevron's TECHRON Fuel
Injector Cleaner to a full tank of Chevron premium gasoline and the problem
goes away. Now, as regular maintenance, I just add a bottle every 3000
miles - when I change the motor oil. Good luck and thank "Dean Dardwain" if
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