So I have been having problems with my Blazer recently running pretty poorly and came to you all for help.

Driving Conditions:
When I get up anywhere from 1500-2500 rpms the car will bog down. It starts chugging and then will go away after a little while or sometimes when I give it some gas it will go away.

Sometimes at stops the idle will be extremely rough and there will be a flickering of the dashboard lights.

At highway speeds (above 55mph) there is a slight jerk while driving and then it will happen again at another time.

Engine Codes:
P0300 - Random Mis
P0340 - Camshaft Pos. Sensor A Circuit (Bank 1 or Single Sensor)
P0108 - Manifold Absolute Press / BARO Sensor High Input

Diagnostic Readout:
Fuel System 1&2 Closed
Calculated Load 17.2%
Engine Coolant: 183 F
STFT Bank 1: 26.5%
STFT Bank 2: 26.5%
LTFT Bank 1: 7.0%
LTFT Bank 2: 5.4%
Manifold Press: 22.1 in hg
RPM: 1686
Speed: 27 mph
Mass Air Flow: 4.75 lb/min


Check:
-Check Fuel Pressure and it was 60 psi at start and never below 55 for 10 min
-New Wires, Plugs, Distributor, Fuel Pump (4000 miles ago)


Just got the P0108 issue today after using Seafoam, but the other have been common codes that I keep getting.

Edit: Just changed catalytic converter and the inside were almost completely dissolved. Most likely to much fuel getting in there. Was wondering what would cause this and if this could be the cause of the misfires.