I need help I'm in a position in what I can't figure out anything

My key fob quit working, then the check engine light came on and now at speeds from 70-80 the TCS cuts out. The car shudders the TCS light goes on w/ another Light"SLIP" the car has died twice when those lights have been on. Car is becoming harder to start.

Where is the fuse location for the front blower?
Rear blower works great, but recently front blower stopped working.

When placing the vehicle in reverse, the RSS sensor no longer beeps.

I have changed 2 injectors I changed crank sensor cam sensor have done the timing all the ignition coils and it still misfires is it possible that the car is got a bad air fuel ratio sensor or mass air flow sensor this car is driving me crazy can't seem to think what it could be but I'm going crazy over this vehicle

how to get off the heater core


bolt spins freely and will not go in or come out, may be sheared. How do I get it out and repair?

EGR Valve it's been replaced and I still have same problem. What else can cause this problem.?? And how much will cost the repair??

There are no signs of leakage from anywhere inside car.

The heater does not kick on to warm the cool air, but the a/c works fine. The heater comes on sporadically

It s just a new to me van so need a extra mind speaking head as to help me get her fixed thanks