okay so i have an 89 civic hatch si with 94 ls, 93 trans., 91 b18 ecu, 91 dizzy, not throwing check engine light, but it's running like ****. it feels like it's not getting enough gas. i'm pretty sure i have everything hooked up right, but obviously something is wrong and i have no idea what it could be. any help?

 

bump cause i'm having the same problem

 

injectors...possibly...maybe...just take like a cresent wrench and lightly tap on em maybe it will help...did with me

 

+1 injector or vac lines

 

You can throw codes without a check engine light going off...have you checked for them yet? Might save yourself time if it is.

 

So I'm not throwing any check engine lights. I've pretty much gotten them all to go away, but now it still runs like ****. Thing's I've changed and or made sure were in working order. Fuel filter, Fuel lines, Fuel pump, Injectors.
Take into account that right before I did this swap I started the vehicle with the donor motor, it ran perfect and that was a week prior.

 

check the ground strap... i had a loose one once and it caused mine to run like ****.. other than that.. check wiring, and make sure all vacume lines/ electrical connections are hooked up good... even though u dont show a cel on the dash.. check ur ecu... obd0 units will have a light that flashes to tell u engine codes... make sure your not throwing codes... if none of those work... im unsure of your problem