A step-by-step guide on replacing timing chain cover gasket needed?

Here's the removal and installation steps. The torque specs listed for the cover bolts are:

Timing Chain Case Cover Bolts M8 Bolt 20 ft. Lb
. M10 Bolt 40 ft. Lb

There are no common failures that I'm aware of with this engine. I have three of them. One is in a '94 Grand Voyager with 287,000 miles. Another is in a '95 Grand Caravan, and the third is in a '93 Dodge Dynasty with less than 5,000 miles. I have other vehicles with the 3.0L Mitsubishi engines, but those use timing belts that run the water pump. Those parts along with their tensioning devices are common items to replace. The 3.3L uses a timing chain. If you find looseness in that chain and want to replace it, I'll find the additional instructions for you.

One thing to be aware of if you disconnect the battery as instructed, the engine's idle speed will be too low. It may not start unless you hold the accelerator pedal down 1/4". It will not give the nice "idle flare-up" to 1500 rpm at startup, and it will tend to stall at stop signs. All other learned sensor personalities and fuel trim numbers will be relearned as soon as you start the engine. The one notable exception is "minimum throttle". Once that is relearned, idle speed will be back to normal.

To meet the conditions for that relearn to occur, drive at highway speed with the engine warmed up, then coast for at least seven seconds without touching the pedals.