I'd try flushing the system and burping it. as antifreeze breaks down it kinda sludges up, it may be partially blocking some of the passages in the motor. like said before, check the low and high speed fan at idle.
is it getting fuel pressure at the rail?
[COLOR="Black"][B]2004[/B][/COLOR] [COLOR="Red"]Torch red[/COLOR] [COLOR="Red"]mach 1[/COLOR] Cams, mac long tubes, lethal offroad X, magnaflow IRS exhaust, strange front coil overs, strange 14" 175lb springs, 4.30's, FRPP 31 spline differential, Moser 31 spline axles, steeda tri-ax, exedy 2 clutch, FRPP throw out, FRPP pilot bearing, MM clutch goodies, K&N poly intake, SCT tuned
[B][COLOR="black"]1996[/COLOR][/B][COLOR="DarkRed"] Lazer red GT[/COLOR], 2002 Pi swapped, stage 1 cams, shift kit, ram air intake, UPR offroad X, flowmaster dumps, 125 wet shot...