5.3 sputtering at high rpm only under load and only with good plug wires

[Shawnbonay]

I have a 03 Silverado  .its got a cam in it .tbss intake manifold 36 lb injectors been tuned on dyno. But i put Taylor wires on it then edelbrock now msd wires on it and when i punch it and rpms get to around 5000 it starts sputtering bad but does not do this when i jst rev it up only under a load.but what i dont understand it only does this with good wires if i buy cheap wires from autozone it wont do this & i cant find know one who has heard of this problem. Any help would be awesome. Thanks

[diyer2]

If it was me I would put OEM(AC Delco) wires on it. 

[It's Tim]

Fuel pressure.

[CamGTP]

Expensive wires just make your wallet lighter.

[Mike GMC]

2 hours ago, CamGTP said:

Expensive wires just make your wallet lighter.

True, but they look cool.  My guess is, your coil packs are still stock and 17 years old right?  Look into the MSD multi spark coils.  I bet your stockers are getting weak.  You might also want to put an ohm meter on the fancy wires.  Sometimes they actually have higher resistance than the OEM.

Edited August 26, 2020 by Mike GMC

[CamGTP]

Who cares how they look, people drive with their hood closed don't they?

 

I'm a firm believe in stock coils or nothing. I've worked on some many LS engines and having a dead coil or weak coil have been few and far between. Seen engines with 300-400,000+ miles with original coils.

[Mike GMC]

That was a sarcastic comment. Sorry I didn't make it more obvious.  Sometimes people have to earn the hard way that chrome don't get you home.  I've owned 4 early LS engines, and my experience matches yours, never a bad coil in over 600 I miles combined.  However I have seen a bad coil.  I've also seen what the MSD coils can do, they are pretty amazing.  He did state his own fix, stock wires, so the rest of this is just for fun anyway.

[Mike GMC]

1 minute ago, Mike GMC said:

That was a sarcastic comment. Sorry I didn't make it more obvious.  Sometimes people have to learn the hard way that chrome don't get you home.  I've owned 4 early LS engines, and my experience matches yours, never a bad coil in over 600 k mlIes combined.  However I have seen a bad coil.  I've also seen what the MSD coils can do, they are pretty amazing.  He did state his own fix, stock wires, so the rest of this is just for fun anyway.

 

Edited August 27, 2020 by Mike GMC