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Just a couple comments, a custom tune will always help, LT1s run a bit rich from the factory so a tune will help throttle responce and top end. Add that you deleted the EGR and the car will need to be leaned out during cruising RPMs even a bit more.
Idle issues is more likey related to caruum or in your case the exhaust leak. Very often a leak will actually result in air being sucked in when the other cyclinders on that side pulse, that added 02 results in the ECM making the car run even richer. So the first thing to address is an exhaust leak. If you can scan the car you'll see the DS is slightly richer then the passenger side due to the leak.
Loose spark plugs, I have a offset wrench, that or the SLP short sucket is a good investment for working around Long tubes.
My opinion! go with a stock or Accel coil, the MSD is too hot for a stock Opti and shortens its life span.
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
Last edited by Pampered-Z; 09-08-2010 at 04:00 PM.
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