NEED HELP! Codes:P0171, P0174, P0304, Symptoms inside

[tom4bren]

Are your gear select indicators on the dash indicating correctly? The tranny should be signaling the ICV to adjust for the tranny being in gear or out. It sounds to me that it's sending the right indication but the ICV is still not reacting quite right.

Did you replace your ICV or replace?

[taylorRichie]

I replaced the IAC with a brand new one.

Well I may just bring the car in for a diagnostic

All Original Codes Came back:
P0171
P0174
P0304

Doesn't make sense to me...

I swapped the coilpack with a different one, to see if the code would follow... It didn't, and all my coils (all six) check out with a Multimeter...



Could a vacuum leak, logically, cause a misfire, and not only a misfire but one on a specific cylinder?