could be for the IAC, or maybe you got the coolant and the IAC hooked up backwards, check those, and the fuses to see if all in good shape

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