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Discussion Starter #1
Happy Thanksgiving Everyone, having said that,I have started to have a surge issue with my 04 Colorado 5cyl. It bucks slightly at freeway speed, but seems to be fine at idle. I just changed the plugs, but being an older guy with other problems, I don't remember if it was doing this before the change. I don't think it was, but if so, it may have been just prior to changing the plugs. Can anyone suggest a cure? Thanks in advance. JT
 

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What spark plugs did you get. I would reccomend cleaning the throttle body as well as the mass airflow sensor with their respective cleaners ( throttle body cleaner / maf cleaner.) These trucks like iridium spark plugs. Cleaning the tb took care of my surging issues
 

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Can you pinpoint and describe the trucks bucking condition? Speed, rpm, what gear or gears it happens. Or if you have any cel .
 

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This is not likely the problem that you have, but someone recently reported a similar issue. Seems that low fluid level in the transmission was causing the surging.
 
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