would a new coil pack help the mileage i know that the resistance on mine is a little off? Another thing when i pulled the last set of plugs (splitfire) they where covered in carbon like it was running rich. before that i had bosch plats and changed them after a day because of a misfire and they were also covered in carbon after a day so why would it run rich like that because of the coil? wires? (need new ones for sure) the ecu? O2 sensor?? help please

98.5 Black SE ATX S&B filter, SVT MAF, optimized SVT TB, mesh grille, removed orange reflectors, painted rear reflector, gutted pre-cats, optimized SVT LIM, 19lb injectors, resonator removed cant afford an svt but lookin for 1 in nc