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LS not running smooth at constant speed
I have an 2004 LS with a 3.0L V6 and 89K mi. The car has a skip around 50 mph for the last 50k mi. I have had all the coils and plugs replaced and recently one cat. The car now has a pulsating feel at constant speed. It is most noticable while in cruise control.
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It's just a minor annoyance now, I hope to make it to summer and if it gets worse I'm going to replace all six coils, plugs, and the pcv while I have the manifold off.