so my 1994 lexus es300 was smoking, but it still ran so then i had another engine put in with less miles and i drove it home from the mechanic and then after words it would start then die every time. what another mechanic told me that the computer that needed to be reset. what i needed to do was turn the key to the spot before it it starts the car and leave it there for 10 minutes then turn the key off then back on again for 10 minutes then off again and then on for 30 minutes and put it in drive for like a minute then back in park and start the car. it worked and my car has started normally ever since. i hope this helps someone
