I have an 89 F350 w/460 efi.

I have been running into a few annoying issues. First the trucks idle has always been unsteady since I bought it, about 500 miles ago. Also it is a little hard to start when its hot/warm.

First thing in the morning or after it has sat for a few hours it start right up with maybe 1 second of cranking. Once warm it takes maybe 3-4 second of cranking and it barely starts up. It will catch and stumble and stutter at about 3-500rpms for a few second and then it will idle OK. It always starts, never stalls and runs pretty darn well.

This is what I have done so far:

distributor cap
rotor
motorcraft copper plugs
wires
fuel filter
new rear fuel pump assembly
all new fluid in everything
new rad. hoses and thermostat
oil pressure sending unit
coolant sending unit (gauge)
coolant temp sensor
intake air temp sensor
idle air control valve
set timing to 13 degrees with spout unplugged
*updated list of parts*

I think I may back the timing off a little to see if it helps the hot start issue. I am going to install the coolant temp sensor for the computer, then if that does nothing I will replace the TPS. After that I guess the ambient air temp sensor if it has one.

Anyone have any other ideas and or disagree with my thoughts? I am also going to get those rubber plug wire holders so the plug wires are not laying on top of each other.