Hello all. First post, so nice to have a resource like this.
I recently got a hand-me-down 1991 LS 400 from my brother-in-law. 771K and still going (more or less...)
It had a leaking fuel line, so I replaced all 3 lines and the fuel filter. I also changed the air-filter, cleaned the TB, and changed the oil. I now have a rough running isse...
Car won't start on first attempt, but will always start on second try. It runs rough for a while after startup, but is still driveable. It will pull at WOT just fine, and it seems that all problems go away at 2500 rmp. It is as if it has a separate set of cams of something, because it will start to haul right away. It seems that at low rpm, and under heavier load like a hill, it will start to bog down and start to chug, but so long as I go to full throttle, it will overcome it.
I have cleaned the MAF, and checked the plugs (which were fine.)
The car has thrown no codes at all, so any suggestions would be appreciated.
Thanks in advance!