1998 Mitsubishi Galant - Answered Questions & Fixed issues

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you have a internal problem with your radio it will need to be replaced

you lights all. One can be on and the bbulb maybe burn . Something is draine it. Stereo. Something is on and you don't know-it .

trottle sensor, temp sensor ,ecu...

I don't think you HAVE a problem. The AC system puts a significant extra load on the engine, and a slight loss of performance is normal.

check for good ground from the pump wiring with a continuity tester with the battery dis-connected from the car

You should only have one power wire on the pump and one should be a ground are you sure you have power on both?

the location is in engine compartment, there's 2 fuses one of left, one of right, the one of the right is the fuel pump relay, they are the closet relays to the headlights

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Better check for fuel leaks first, from the engine to the tank. After that check the fuel pressure regulator. Do a fuel pressure test, if the pressure drops fast, you may have open injectors.

The fuel pump relay is located below the dash, in the center console area bolted to the vertical metal uprights that support the dash. 
Depending on production date, the MFI and fuel pump relays may come together or separate. If together, the relay comes as a module consisting of both relays attached together on a metal bracket. 
The relays are normally $27 each.

have an ac specialist check the gas pressures and the compressor as it is drawing too much power from the engine or too much power from the ignition circuit I would suggest a compression test in the engine as well to get the engine condition. Most ac compressors take about 5hp to drive and if the engine is a bit sad then that is too much power overall.

use a scanner that is capable to read transmission codes and data, if there is no codes, check the pressure from the transmission test ports, because is leaking pressure internally.

Dude....putting 2 stroke fuel into a 4 stroke engine is just silly, but not where your problem lies. Check the coils to see if it is generating spark...if not then check the ignition module....even 'oily' the plugs should fire.

It's either a bad switch or a wiring short. I'd bet on the switch. Disconnect the battery. remove the switch and test with an ohm meter.

neutral safety switch is generally located where the shift linkage enters the body of the transmission.

transmission problem

the transmission kickdown cable could be the issue if it has one. or the transmission needs fluid. or is damaged has mechanic look at it.