Atomic1974

Just bought my second ever ls400 its a 94 with only 168k miles. Bought it for 500 bucks because it had a knock but it wasnt that bad and drove perfectly fine. Changed oil with 10w-30 and a quart of lucas and it ran amazing with 0 knock just a big of tick but i figured it was normal since its old. Now about 7 days later it keeps getting a random cel and running like crap like a cel. Car isnt knocking or anything but im getting these three codes
25, 26, and 52. Anybody else ever have this issue? Its still driveable but when the cel happens i just put it into neutral turn it off then back on and back into drive has happened about 4 times now is getting annoying.