1995 GMC 2500 Bad Lope

[mupchurch80]

Hopefully someone here can help. I have a 1995 GMC 2500 with a 350 it developed a bad lope over night, i have done the following.

rebuilt throttle body (twice)

new sprayers

rebuilt fuel pressure reg

new tune up ie. plugs, wires, cap and rotor

egr

map

mass

vacuum lines

throttle position sensor (twice)

both coolant temp sensors (twice)

a lot of others parts i cant remember the names of.

weird thing is you can put your finger over one of the sprayers and it idles fine or if you turn the ac on it idles fine.

Any help would be appreciated.