04 Crossfire with multiple codes ..
P0171, P0172, P0174, P0175, P0102, and P0221 ...

Things we've done recently::
- https://www.crossfireforum.org/forum...odies-now.html ... no change
- cleaned the MAF with MAF cleaner
- replaced O2 sensors ... they were completely crusted in carbon
- tried a different gas pedal.
- replaced vacuum lines, all except the one that goes into the manifold. I read the post on this and so simply splicing in a new one is on our to-do list
- reseated / sealed gaps in the air intake - previous owner installed a custom one that just 'sat' on the engine and wasn't really connected ...

Previous related work was replacing the fuel filter about a year ago. In addition to the vacuum hose, I also plan on running some cleaner through the engine to remove any carbon build up

When we step on the gas, there is a chuff -vroom with a half-second delay... the 'chuff' is air intake opening like on an old hurst carbuerator.

Does anyone know of a common denominator for these codes all appearing at once?

Thanks for any help ...