Drivability issue

[stang389]

Hey guys I think this should go in here. Having a drive ability issue after car is in closed loop and has been city style driven - haven't had the issue on the highway. Modes are- c&l racer intake, imrc delete plates, off road x pipe, and a woodbine motor sports tune. Car will stumble and studer like a dead miss or the car firing cylinders at the wrong time. No check engine light or codes. Any one have an idea of what's going on ??? - car is an 07 mustang gt 5spd manual.

 

[michael.konor]

Did the change in drivability occur right after a recent change to your setup and/or tune?

 

[stang389]

Yes it did, but I switched back to an old tune I had for these mods and the issue is still present.

 

[RLF9409]

Check all your connections. Almost sounds like a vacuum leak or something like that.

 

[AutoXRacer]

Do you know what your fuel pressures are?
How old is your fuel filter?
How many miles on plugs?

 

[stang389]

Brand new fuel filter less than a hundred miles and plugs have about 6k on them and look good

 

[BruceH]

It sure sounds like a vacuum leak.

 

[stang389]

Figured it out - 3 plugs had worked there way loose. All back together and running good

 

[michael.konor]

Which three plugs?

Where you at in Texas?

 

[stang389]

Drivers side I believe it's 6-8