Kevin Callahan
Newbie
I've read a ton of posts on here of people having issues but nothing quite fits the symptoms I have. My 97 tahoe with the 5.7 vortec will stumble while cruising. Speed doesn't matter much just needs to be a consistent speed and rpm. 65 on the highway or 35 it will act up. Rpm will drop a couple hundred for half a second then jumps back up. Zero codes thrown. Have done a tune up with zero change. Leaning toward a bad torque converter locking and unlocking. I've tried the lightly holding the brake test to prevent it from locking up and the shudder is considerably better but still there. Idles fine and hard throttle both are fine as well. With no codes I'm at a loss. I don't want to just throw a torque converter in it if that's not it. Trans was rebuilt by a reputable shop 4 or so years ago. Fluid is full and clean