CODE 7, 13 and 20?

Im having trouble starting my car,it is a 89 crx si but im running the D15b2 motor since the Si one bleww ;( I checked the ECU and its trowing CODE 7, 13 and 20. Code 7 (7 flashes) Throttle angle, Code 13 (13 flashes) Atmospheric pressure, Code 20 (20 flashes) Electric Load does anyone know what I can do to fix any of these? anything would help. thx

Sam

...swap the engine out...

jk, did u reset the ecu just to make sure all those codes are recent?

damn thats alot of codes lot of flashes. probley knock out after seing all those flashes. i had a throttle position code once. took about 20 min to fix. dunno know bout the rest though.