hi i've just brought my first honda civic eg6 with b16a2 engine but i'm haveing trouble with its power it seems to run very flat and doesn't always hit vtec properly, i can hear the change but its not kicking in as hard as it should. i've just had the dizzy changed as this had packed up, could this cause anyproblems to its power?? i no theres not much info to go on but any info to help sort out this problem would be much apprciated thank you

 

just done an cel check and got back these codes 9 cyp sensor/ 43 fuel supply system/ 8 tdc sensor/ 1 oxygen sensor/ 15 ignition output supply??
with these all needing replacing would this actually solve my power issues or could there still be another problem im not finding thanks