robali

Recently bought a 1995 LS400 Lexus which has a transmission issue. It engages all gears, but only moves in reverse and 1 or L gear. I have done a complete flush of the transmission fluid and replaced the fluid and filter. Still have the same issue. I was told by a transmission repairer that it might be a foul issue, which I assume means an electrical issue. Everything else works perfectly. Thought it may be seals and solenoids? Any ideas or help would be awesome.