[bmuum3]

Having an issue where car sounds like it has a big cam. Once it's warm I rev it to 2k RPMs and let off the gas. The RPMs drop all the way to the 300s and the car almost stalls and then recovers back to normal idle. I don't get any check engine lights or codes.

LPFP is brand new and never drops below 60
Injectors are tested and good. No leaks
New coil packs and spark plugs.
New o2 sensor
New valve cover gasket.
MAP and TMAP have been cleaned
PCV delete and flapper delete, straight to catch can which VTA

[iqraceworks]

Originally Posted by bmuum3

Having an issue where car sounds like it has a big cam. Once it's warm I rev it to 2k RPMs and let off the gas. The RPMs drop all the way to the 300s and the car almost stalls and then recovers back to normal idle. I don't get any check engine lights or codes.

LPFP is brand new and never drops below 60
Injectors are tested and good. No leaks
New coil packs and spark plugs.
New o2 sensor
New valve cover gasket.
MAP and TMAP have been cleaned
PCV delete and flapper delete, straight to catch can which VTA

Record a log and see what's going on. Are your AFR's getting crazy rich when it tries to stall out? If so...I would double check to make sure your injectors aren't leaking.

Am I understanding that right....you have a PCV setup with no flapper/check valve, and you vent to atmosphere? Isn't that just giving you one big vacuum leak?

Also...what is your LPFP pressure at idle? It should be right around 72-80 psi.