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Chevrolet Express 2500 Questions

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1st the lower 2 speeds stopped now the upper 2 have stopped as well. What's going on? I already changed the speed control relay that is next to the blower & still nothing.
1st the 2 lower speeds went now the 2 upper stopped as well I changed speed control relay under the hood next to the blower but still nothing. What's going on???
I just recently changed the oil pump and sensor in my 2004 chevy express however while driving the pressure says 20 then drops to almost 0 what could be the cause?
One year ago my fuel gauge worked perfectly, then ran out of gas at 1/4 tank, now at over 1/4 tank I ran out of gas. My vehicle does not keep running now. Can the fuel sensor keep my van from running. Fuel pump pressure running is 55, key on is about 59. I have 198,000 miles on my van. OBD 2 shows O troubleshooting codes.
Replaced diagnosed Ignition Module, cleaned and replaced TBI, and put on a new AC idle air control valve, worn out key replaced, then replaced ingnition key switch. Still dies in a few minutes to 16 minutes. Drove forward once, and engine died, and engine lights on dash went out. Instrument cluster on dash light stays on "gages" with key on. No dash warning lights on while running. Did DBD 2 tool scan with 0 troubleshooting codes.
Stays barely over 100
The secondary air monitor hasn't completed no codes are present
The van seemed to be operating fine until I got rear-ended by 2 cars in a 4 car crash. Since then the O2 sensors went crazy & I had to replace the engine coil, fuel pump & rear axle.
I blew the in line fuse 30amp to my toggle switch, and my van only runs 5 min. each time since about. A green 30amp fuse large in the relay box was corroded but the fuse tester said it was still good, replaced. I put a test light on fuses in relay control center and no light with key on. Fuel pump pressure is less than 60 recent test. Vehicle runs good for 5 minutes. After the fuse blew I drove over 90 miles then the motor was acting to cut out and sounded muffly.
I have replaced the multi-function switch, all fuses test good, and all bulbs are new
AFTER VAN SHIFTS OUT OF SECOND GEAR IT STARTS TO HAVE NO POWER AND SPEEDOMITER GOES WAY UP BUT VAN SPEED IS NOT GOING UP
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