2003 Dodge ram 1500 slt stalled and shaking engine died

Hey there, so I started up my ram one day and it
tried to turn over but just couldn't, left it for a day
and tried again....started up with slight hesitation.
Then I began driving on the highway ( doing about
80), I began to lose acceleration and the brakes
and steering locked up and it began to shake
slightly. Once I tried to start it backup it started to
shake quite violently. I had it towed and now it's
back to trying to turn over but can't Andi have a
flashing CEL.
- changed crankshaft position sensor, gas cap,
spark plugs
-checked camshaft sensor (looked like new)

Any advice would be greatly appreciated! Thank
you