When I start the trailblazer and put it into drive with the brake on has a rough idle feels like engine not getting enough fuel or air, but when you drive it for about 20-30mins the rough idle goes away than it's smooth, only does it when it's starts up,. So far I have clean the thottle body, did a relearn of the TB by disconnecting the battery for 30mins, replace the spark plugs, replace the ignition coils, and replace air filter, but still getting the same rough idle when I start it up,
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