SHELBY GT 350 Member
Joined: Sep 2010
Location: see user name
Think they call that misfiring. Doublecheck that cel to make sure you're not getting a cylinder specific (P030x) dtc. Pull the COP's, inspect the boots for any damage or deterioration, replace as necessary. With the COP's out, look down into each of the plugwells for any moisture (coolant). If it's wet, find out why. Next, pull and inspect the plugs - if it's been a while or never then just figure on replacing them. You can get arguably the best plugs for your car, regular copper tip Autolite 764's very inexpensive, otherwise a stock replacement platinum plug is fine.
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