I have the exact same problem with my 1995 5.8. I repalced the iac and it did not help. If I unplug the iac, the idle slows to 1000rpm. When I reconnect it, it runs 2300rpm. I check for vacuum leaks by spraying starting fluid on all lines. When I mash the accelarater it falls on its face like it is out of gas but if I let off and down shift it regains power. I can drive it 100mph if I just ease in to it. Any help would be much appreciated. It has been in and out of 3 ford garages and they could not fix it, it has sat in my garage for 1.5 years since I cant fix it.
Tuesday, March 24th, 2009 AT 7:02 PM