Originally Posted by Pampered-Z

How old are your wires and what brand? I don't see anyone mentioning replacing the wires other then the coil, which is a common problem with corrosion. I had a few cases of wires going bad, after markets that don't fit in the stock holders can easily be cut through trying to force then unti the holders or by the belt or pullies where they run behind the PS pump, or even just damaged from the headers. I chased a freaken problem with the car shuddering badly after it went into closed loop and the engine was up to operating temp. Chased it for weeks and found out the #6 wire burnt just slightly on the header and was arcing to the knock module and it never threw a code!

Make sure the wires are run so they aren't near anything or against each other.

Are you running the stock heat range on the plugs? If the car is that rich maybe the colder plugs are adding to the problem?

If you think it's injector related, I have a set of stock 24lbs you could borrow.

It's very, very rare on the newer cars, but on the 93-94s there were also some cases of the harness on the top of the engine being bad causing intermittent problems with injectors not firing - actually pairs of injectors not firing ( batch fire back then and wired in pairs). with your car running poke around at the wires, wiggle the harnesses and such and see if anything happens.

Moister may not be getting to the opti but maybe leaking or sitting back by the ECM harness? I would look at that wiring as well.

JB