Hi Scotty! I have a 2005 Trailblazer 4x4 4.2L I6. Just turned 230,000 miles. On the highway, between 1500 and 2000 RPM, the truck shudders periodically. If it shudders and I give it a little more gas, the shudder stops and then comes back when the RPMs go back down. If I drive in 3rd on the highway it won't shudder and everything is great in town. What can I do to fix this?

Thanks!

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No. 1-4
Believe231
Believe231

It could also have a skewed sensor issue (MAF) or worse yet, a mechanical engine problem if it only happens in certain rpm ranges, me I'd get rid of it asap before it gets much worse.

ScottyKilmer
ScottyKilmer

Me, I wouldn't go that far from my customer's experience with those things at THAT mileage

Wil
Wil

Bummer. I guess it's time to start thinking about if it's worth rebuilding. Thanks for your time!

ScottyKilmer
ScottyKilmer

unfortunately for you the transmission is starting to go out if it has an automatic transmission, typical on those and normally they don't go that far anyway. if it's a standard transmission, it would be something else that causes shudder on a load, such as dirty injectors or a weak fuel pump.

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