LEAAAAANNNNNN/tranny, help :)

[ekopel]

aight, ive got a problem...i decided to start my tune over...due to gas mileage issues, and right now im running no correction on anything with my safcii...the only thing is, in first gear between 1 and 2k rpms its almost as if there is an insane amount of slippage somewhere...and my AIR/FUEL ratio goes down to the leanest it can go...any explaination??? also, im assuming it is correlated, at stops when the car is warm, the idle is usually good, but sometimes it will jump jump jump then die all the way (stall)...no codes...i used a genuine scanner...i just had my transmission fluid changed, and forgot to tell my tech that i used to put additive in the oil to make it thicker (had similar, but different problem before), maybe this could be it?

btw, 1mz-fe auto

[nodrogkam]

i had used lucas oil additive in mine and i must say it gave me the illusion of helping but in the end was worse, so i changed my fluid a couple of times and now its a lot better. don't use the additives unless you're leaking. you're much better off with simply changing with a high mileage tranny oil.

I assume since you tune your car, you probably drive it hard - and since you're from socal you probably drive hard anyways - double check that the transmission fluid doesnt emit a burnt smell - maybe harder to detect now that the fluid was just changed.

I hope its not slipping but it very well could be, but i say stay away from additives unless you're burnng oil or leaking - in which case the car needs to be repaired anyways not just patched.