Atf-4

The throttle pressure rod is adjusted so at WOT it's all the way back to it's stop.
I've been having this problem for a few years now and can't figure it out.
I've tried everything mechanical and it was taken out, resealed and installed 4 times in 2 years.
I was just wondering if the ATF-4 in it could be a problem because that's about the only thing I haven't changed.