General rule of thumb – very general, there are certainly exceptions – if the “check engine” light comes on and there are no other symptoms, it’s not an urgent matter. That doesn’t mean it’s not important – sometimes it is, sometimes not – but the light in and of itself doesn’t mean something must be tended to right away.
Now, if the light is flashing, that’s a different matter – it could be doing further damage and should be checked ASAP. It’s not going overboard to pull over, shut the engine off, and wait 5 minutes before driving further.
Back to the OP. I would say that everything expressed so far has merit. It might reasonably need all, some, or none of what was recommended. We’re all guessing somewhat since we’ve seen neither the car nor the test results. That said, here’s my armchair evaluation:
02 Sensor Upstream (Oxygen Sensor), Downstream 02 Sensor (oxygen Sensor)
Hmmm. While it’s not impossible it needs both oxygen sensors, it’s not too likely. I’d be very reluctant to replace either of them, much less both, without having tested their operation. Just a code that mentions an oxygen sensor isn’t sufficient info to condemn one. Many “oxygen sensor” codes – e.g. “O2 sensor always rich” – don’t mean that the sensor isn’t working right, rather that the sensor is accurately responding to the root problem.
V/C Gasket (Valve Cover Gasket)
Hmmm. Why? It’s extremely unlikely this has anything to do with the “check engine” light.
Rotor BWD Ignition Rotor, Dist. Cap BWD Distributor Cap
Usually fairly easy to test, not an uncommon problem.
Tailor Mag Cor Wires BWD
Again, fairly easy to test and not an uncommon problem, but…what you’ve listed sounds like some fancy-schmancy “high performance” plug wires (Mag Cor?). That sends up a red flag to me, in terms of trusting those wires to work properly. I suggest high quality original-design type wires.
Replace Fuel Filter Pkg
Package? What the hell is a fuel filter package? Presumably this is for maintenance, which is fine – for maintenance. If this is to fix the “check engine” light problem, then all the other stuff isn’t needed for that reason.
I’m away from my books now, so I can’t check this, but I suspect it’s because the plenum ( = intake plenum = upper intake manifold) has to be removed in order to replace the valve cover gaskets.
My impression is that most of these items are on the list because the employees at the shop are trained and encouraged to sell, sell, sell. That doesn’t mean they aren’t justifiable repairs to recommend, but it’s a sure bet that not all of them are related to the light coming on, and it’s somewhat questionable that any of them will acutally fix the situation. I’d be inclined to seek a second opinion from a reputable independent shop (not a chain operation).