i have the following codes on my car 14 (idle air control),22(vtec oil pressure switch),3(manifold absolute pressure),4(crankshaft positon),7 (throttle position circuit). i need need to know how to check and fix all of these problems.

 

you check all the connectors? the Vtec Preasure switch is the green connector right behind the Vtec Solenoid. the other sensors are on your throttle body and intake manifold, make sure all the connectors match up, and you didnt accidently put the wrong harness on the wrong sensor, its possible.