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The most common cause of blue exhaust smoke is oil leaking past engine seals and into the cylinders where it then mixes and burns with the fuel. Oil leaking into the cylinders can cause a rough idle, misfire and fouled spark plugs. So best bet is to have a local repair shop inspect for internal oil leakage.
With out seeing the car or the smoke, I can guess that you are leaking water into the combustion chamber. Have you noticed any unususal water loss or oil loss? Most likely cause for this is a bad head gasket or intake gasket.
Have you overheated or are loosing coolant? If not check to see if your transmission has a vacuum hose going to it. (if coolant you can smell it in the exhaust) I don't think you have the trans hook up but can't remember.
if it is white smoke the rings are going out. if its black smoke its running to rich. if it smokes on first start up and then clears out it is valve seals.either way it is costly to repair.
It's the ECU. Very common with the early '90s lexus cars. Everyone will say head gasket, but unless your oil is milky white, it's not coolant leaking into the cylinder. Buy an ECu on ebay for less than $100, it plugs in under the dash, just like a computer printer. Easy fix.
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