I had a similar issue with my '94 Cobra last winter, turned out to be rotted vacuum lines. My understanding is when you go WOT vacuum pressure cuts out, so you won't be sucking it air and lean condition goes away. I think.
Found a few missing vacuum hoses they are capped off. One on tps and one next to the fuel pressure regulator hose. I Believe a green hose goes to egr valve and a red hose goes to the other one but I can’t find where those hoses come from. I have them circled in the picture below thanks
you are correct on the green/red hoses. I'm in the process of replacing mine - they were brittle and snapped when I was replacing the EGR valve. Here's some pictures of where they lead to on my '94 I'd imagine the '95 is very similar. Note my air intake is off in these pictures.
First picture is the junction they head to, normally sits under my CAI (I've pulled it out of place to get the picture)
Second picture to show where that third hose leads to, not sure what that is.
Now with it lying properly, you just barely see the green & red lines going under the fuel lines then the throttle body, from there they run back along the valve cover
Picture of where the red line comes out from under the EGR (green one should be in the sheath with it but is MIA right now)
Sorry for the bad MS Paint work, but I've outlined in blue where that line heads in the fender after the junction
If you think it would be helpful, I do have older pictures when I had that passenger side fender off, showing where the lines head to under there, but the pictures weren't taken for that purpose so its a little jumbled. Hope this helps - and if anyone has advice on sourcing replacement lines and shielding material, I'd appreciate it. Haven't looked into it yet.