efritz

you just need to add a diode from the current carrying side of the DRL relay (also, and separately) from current carrying of the headlight dim relay to the coil side of the fog relay. you can easily do it from the top of the underhood fuse panel by inserting the ends of the diodes in the relay terminals. I've done it twice.

You might have to be the first one and tell us how it goes!

Pull one of yours and see how many holes, then order the same ones if you have determined it as the cause. Did you check fuel pressure and the condition of your O2 sensors? These engines do not have common fuel injector issues, in my experience the p0300 code is often misdiagnosed, and the true cause is leaking intake manifold gaskets as the GM ones from 99-07 shrink over time and allow leaks causing mixture issues. As old school as this sounds, you can still pull the plugs after a hard bit of driving and see if one cylinder is grossly lean, tiny variances are not noticeable.

Yeah rust doesn't happen in the winter... It happens in the summer as the salt absorbs moisture and sits wet on the metal.

The bed is two pieces on these, and where they meet there is V shape above the wheel well in the sheet metal that is created. Salt and dirt collect here, stay moist, and rust the metal. There are three washout plugs on the upper backside of the rear fender just above the upper lip. Pull them out and flush with lots of high pressure water a couple times a year, especially in the spring. If you have rear wheel well liners (i.e. rust collectors) remove them and throw them away and then you can get at these plugs, otherwise they will be hidden. there are also a bunch of these plugs on the backside of the rocker panels, for your flushing convenience. Do this and the sheet metal will last twice as long, I do.

I would pull your 1-2 accumulator to see if it is cracked, it's easy to do in the pan, when one cracks, you get a slipping 1-2. Also see if the Vette servo helps, it may allow for more apply pressure. More than likely the 2-4 band is toast, along with the reverse drum. If you just want to limp a few more months, dump a couple bottles of lucas trans fix in and keep limping it along, but it's probably toast.