NYC LS8
Dedicated LVC Member

Mine does that, too sometimes. Even after replacing all 8 coils and plugs at once with two newer VCG done by the dealer. I just deal with it, because I'm tired of getting pissed about it. lol
... There's just a little shake every once in a while when idling.
do a bigger search...I believe the 03's had throttle body issues
Yeah. I should also mention what prompted me to get it fixed.
I cranked the car up on Sunday, after I hadn't driven it all day Saturday.
The RPM's immediately spiked to 3,500 or so. Then they fell down around 0. After that, the engine began to vibrate and jerk erratically, like it does when failsafe mode comes on. I shut the car down without even putting it in gear. After that I smelled gasoline, and didn't drive it. Today it drove fine, up to the dealer.
Anyway, I can't find any info that tells me whether or not I'm getting ripped off with the $160 fuel injection cleaning. They already cleaned out my tranny fluid a few months ago, from what I understand, that was definitely necessary.
Yes, fuel injection cleaning is a rip-off. Not only that, it can do some harm and reduce the life of the injectors slightly. Open your service schedule booklet. You will notice that one of the things never mentioned in all of the 150K miles that it covers is fuel injection cleaning.
Just doing a search had etc engine failsafe mode come up this morning when I was trying to pass some cars, does a check engine light come on when it is the coils?
yes, it will either flash to tell you to slow down,because the engine cant handle and the coils goes bad, or it goes solid if a coil is completly bad