1991 GMC 1500 Pickup Questions

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I filled up my gas tank too full I usually only keep it a quarter.
The next day it would not start replaced fuel pump fuel filter plugs wires distributor and module started up ok but when I put it in gear engine shakes rattles low-power stalls out
Ok here is my store. Have had the truck for 15 year. Daliy driver. Stopped driving it about a year ago. Only on the weekend. 6 months ago I put in a new starter and a new distributor due to it blowing ignition fuses. 2 month ago. I had to jump it to get to work. Got to work and it would not start again. The battery was old and not holding a charge. So it stat still for about a month. Just got a new battery but now it won't turn over. I did a tune up on it just to make sure but still won't turn over. I checked the coil and plugs for spark and it dose have spark. It has gas(half tank). I can smell and see fuel in the throttle body so fuel is getting to the injecters. But still won't turn over. It wants to but doesn't. Any ideas or area to look at. Also I do have a msd ignition on the truck.
Truck failed emission test at the smog. I replaced the rotor cap, spark plugs ect. But still has a problem. Put a new Egr in. Nothing changed. Truck has a crack before the o2 sensor, timing is off by 10 points. Was wondering why im still having a problem trying to pass smog. The smog people told me that my car is burning "Rich".
My gauges are not reading right and it loses power if I run any accessories. Its not the alternator or fuses.
if I put a bigger fuss it will start like it takes a 10 amp I have to put in a 30 amp to start keeps turning over but don't start
Where is the gas tank pressure sensor located? If I can find it I can replace it..
I have a 1991 GMC Sierra, and i was needing to rebuilt the engine but, I dont want it stock. I want to make it faster but without having to change the wire harness or anything.. Just bigger cams lifters and stuff like that. If yall could please give me a good setup i can follow. Im also having the tranny rebuilt with some goodies too. Its a 700r4 i believe....
Usually comes on when cruise control forces speed up to climb a hill. Always resets when switch is turned off and back on.
One rear cylinder was leaking. replaced both rear ones. Bleed system.Great brakes, light still on.
No picture of the oil cap in books.
I have also noticed and am unsure of the rear axle if u step on the brake and hit yhe gas the pig will move up and down bit the axle sleeves stay with the spring mounts and shocks is this normal ?
filter could it be a egr senser or tbody pump.
Filter i think its t body pump or egr senser
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