Where I pour the gas is rusty, is that difficult to change, and is it expensive?

You could do these yourself. But, you would need a good mechanical knowledge and a decent tool kit. The most difficult of these is the ball joints. Just because they are always fiddly. The fuel filter is either screw on or plug in. and the sway bar is dirty and awkward. Ideally you would use a car lift to do these jobs.

Camshaft position sensor. It needs to know which cylinder is needing fuel, so it can fire the injectors at the correct time. It must have failed you. It should not be too difficult to replace or very expensive.

What's the fuel pressure?

1992 sounds like it due a head overhaul and a nice decoke and some new valve springs and valve stem seals

Wow, nice girlfriend-actually, some trans fluid diluted in gas can clean injectors, but don't thank her either...

It sounds like the crank sensor should be checked, it is low and affected by moisture-check the connector, harness and consider replacing the sensor-not expensive or difficult to do.

It is located inside the gas tank. The tank must be emptied and dropped out to replace it which is not very easy to do if the gas lines, retaining brackets and bolts are very rusty

It's either a dead battery or loose/rusty battery terminals, try to pour hot water on battery terminals and then tighten them if loose, if still it doesn't start and keep clicking and if you had the battery for more than 4 years then install a new battery (you can get a good one for around $50, don't buy expensive ones they do the same job). Hope it helps and please don't forget to rate the answer it helps me with my general ratings, thanks!

If you are sure you are getting fuel, this could be a problem with the ignition coil or ignitor. Sometimes when they start to go you get an intermittent problem like this, These parts aren't too expensive and they shouldn't be too difficult for you to replace. You can also check if rotating the distributor to adjust the timing makes any difference.

FUEL PUMP HAS A BAD CHECK VALVE.FUEL WILL DRAIN BACK IN TANK .SOUND LIKE FUEL PUMP PROBLEMS.

hello, sorry for the bad luck u r having with the 4.3l cpi.........unfortunatly it is common for the "spider legs" to break or crack causing a large fuel leak inside lower plenum... the fuel injection spider is not too expensive or difficult to change, but there is some time involved.. i hope this helps, marty