B.E.A.M.S., Got myself a christmas present Options

[Dangercart1]

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[Dangercart1]

As was previously posted the car was driven Tuesday, but hasn't move much since, so today being a day off from work and school (this is a rare occurrence) Fate and I finally got a chance to get some work done. The problem with the engine was it was getting no pick up with the air intake attached, the pedal would be on the floor and it wouldn't go anywhere. So first thing we did today was build the intake:


this helped a bit but still not running like it should, so next we tackled the check engine light, four codes came up

21, 24, 31, 78
Referring to the list below we attempted to correct the problems, the oxygen sensor is obvious because I have no exhaust right now, and after resetting the light 78 went away, so the only two i'm concerned about now are 24 and 31, any ideas where i should start? also after resetting the everything the car drives much better, but i still feel it's not its best.

OBD1 Codes
1 Normal Condition.
2 Air Flow Meter signal.
3 Ignition signal.
4 Engine Coolant Temperature Sensor signal.
5 Oxygen Sensor.
6 RPM signal (Crank Angle Pulse).
7 Throttle Position Sensor signal.
8 Intake Air Temperature Sensor signal.
9 Vehicle Speed Sensor signal.
10 Starter signal.
11 Switch signal.
11 ECU/ECM.
12 Knock Control Sensor signal.
12 RPM signal.
13 Knock Control CPU (ECM).
13 RPM signal.
14 Turbocharger Pressure.
14 Ignition signal.
15 Ignition signal
21 Oxygen Sensor.
22 Engine Coolant Temperature Sensor signal.
23 Intake Air Temperature Sensor signal.
24 Intake Air Temperature Sensor signal.
25 Air-Fuel Ratio Lean.
26 Air-Fuel Ratio Rich.
27 Sub Oxygen Sensor signal.
28 No. 2 Oxygen Sensor signal.
31 Air Flow Meter signal (Vacuum Sensor signal).
32 Air Flow Meter signal.
34 Turbocharger Pressure signal.
35 Turbocharger Pressure Sensor signal.
35 HAC Sensor signal.
39 VVT-i
41 Throttle Position Sensor signal.
42 Vehicle Speed Sensor signal.
43 Starter signal.
51 Switch signal.
52 Knock Sensor signal.
53 Knock Sensor signal.
54 Inter-cooler ECM signal.
71 EGR System.
72 Fuel Cut Solenoid signal.
78 Fuel Pump Control signal.
81 TCM Communication.
83 TCM Communication.
84 TCM Communication.
85 TCM Communication.