SHELBY GT 350 Member
Joined: Sep 2010
Location: see user name
Sounds like you'll need to remove the aftermarket alarm/remote start, and if there are still problems with PATS (passive anti theft system, aka factory alarm) then you can have the dealer disable it. My guess is that once the aftermarket thing is gone that you'll be ok. Aftermarket alarms and factory anti theft systems tend to not interact well.
2001 GT Convertible
All the usual bolt-on's /200 I6, C4
And a few Explorers too... 2008 4.0 XLT 4x2, 1996 XLT 5.0 4x2, 2003 Sport Trac XLT 4.0 4x4