car stumbles and runs lean on 1/8 throttle

[kleiner]

86 omni glhs. 87 lm module with custom cals.
Symptoms. The car starts fine, idles fine and anything over 1/8 throttle and car runs great. But it is when I shift out of first into second or even third or when cruising I seem to notice it the most. If I let off the throttle when cursing and just slowly step on the throttle (as to keep up with traffic at a steady pace) The car stumbles and shows lean up to 17 for a split second then goes back to normal. If I really ease on the throttle I can make it happen for a little longer. What could this be?

I have tried different cals from different people and still the same thing. Thought this would rule out the cal thing, although this could still be a possibility.
I tried to check the TPS for a dead spot. With an Ohm meter it seems to slowly go up and down with no cut outs. What would the Ohm meter do in a dead spot, cut out?
I do not think it is the injectors, because the idle is fine and I ran some sea foam through there not too long ago.

Any ideas?
Thanks

[87blueshelbyz]

Have you checked your fuel pressure? Have you replaced your fuel filter?

[kleiner]

Fuel pressure is good. 40 psi at idle and looks to go up as I am on the gas. Fuel Filter i have not changed in a few years. but figured it was not this as it only seems to happen in the same spot. I will change it though just in case.