I have a unique problem with my GTI that I need some help figuring out. I'm going to check over my vacuum lines tomorrow and boost piping, but something just doesn't add up
- It won't boost above 5psi without sputtering and backfiring
- On deceleration it has a tendency to die, I've watched the vacuum drop close to -30 in Hg before it dies.
The odd thing is this...
- At idle. vacuum stays between -20 and -21 in Hg.
- In 4th gear around 45-50, the car will build boost to 20 psi and hold. (on a few rare occasions, it will feel like its sputtering under load but no check engine light or misfire)
I have the following
EVAP/SAI Delete (only 3 real vacuum hoses... brake booster, FPR, and DV)
I have not touched the software except for the addition of the 2-step option to the base file for my car. Any help or guidance would be appreciated.