I have a 93 f-150xl 4.9 I just bought from a private seller. truck is in very good shape. Needed a tune-up which I did and discovered he had two of the plug wires crossed. I have them in right order now and engine runs without a hitch except the idle is very high. It kicks down after starting like it should but when driving it kicks up in neutral. I cleaned IAC valve and replaced a couple of rotted vac. lines. Any suggestions?
__________________