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Buick Roadmaster Questions

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I completely have no brakes.
I have a 1996 Buick Roadmaster 350 LT1 5.7, I am having some issues with the vehicle idling rough and seems to be missing. When I turn on the AC the car runs a little better and sometimes after shutting the AC OFF THE CAR SHUTS OFF.I went to AutoZone and had my car put on the computer and I got a EGR code P0400, Mass Air Flow code P0100, and a Catalyst code P0430. I replace the EGR, and mass air flow sensor, and my car is still doing the same thing. I was also told I may have a leaky water pump. I just recently installed new AC DELCO plugs and wires and a new air filter. Any ideas on what to try next or what could be my problem?
NEW PARTS INSTALLED:
PLUGS
WIRES
AIR FILTER
EGR VALVE
MASS AIR FLOW SENSOR

See a video of my car running at

https://www.youtube.com/watch?v=K028uIUMlpM&feature=youtu.be







Is there enough room to clear the pick-up tube by raising the engine in the vehicle or will I need to separate the trans to get the engine high enough.

when I got into my car my right blinker wont shut off an my left wont come on and brake lights wont come on either and I changed my bulbs and my break light switch so what could be the problem
I drained old fluid out and changed all gaskets. now I just need to add fluid
Have checked fuses inside car and nothing shows blown. Air conditioner worked fine until today. Any ideas on what could be the problem??
replaced starter and coil, battery is brand new, also new icm
oil pressure is not stable
I was driving car started to "PUTT" I got home ..cut it off . It never cut back on .my boyfriend kept trying to start it . It started to make some " Cat Scream sound". Mechanic came and replaced the starter...still wont start ... he said he thinks my engine is locked..

Is there any other way we can lubricate it instead of spend 4000 plus to get it fixed

Ps. I did get a oil change 1 month prior ..then oil light came back on ...

PLEASE HELP
locating heater control valve on 1992 Buick roadmaster?
if usend picture woul be even much better
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