Have a 2007 Chevy Silverado and I’m dealing with a bucking/jerking issue when driving. When I first start the truck cold, it runs fine with no problems. But after it warms up, it starts bucking, especially when shifting gears or accelerating.
There are no check engine lights and no transmission codes showing. I’ve already tried unplugging the purge valve — when unplugged there’s no suction, but when plugged back in it pulls suction like normal.
The truck idles fine and can cruise at highway speeds (70–75 mph) without major issues, but the problem shows up more during acceleration or gear cha…
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