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The new computer is in and the rough idle and white smoke is gone. I am currently replacing all the fluids and i need to figure out a way to drop the oil pan. I want to replace all the fluids and i have fuel system cleaner and Sea foam to help clean the engine. Thanks for the help if you have any suggestions about dropping the oil pan please share. I also need to replace the fuel filter but im having trouble finding it any links of diagrams of a 1993 LExus Es300 would be greatly appreciated.

I will relay any other information i have when i check up on the car i did order the computer because all Three mechanics told me the computer was sending their instruments wrong signals ( My family member didnt replace it because he didnt have the money to) .. other than that i have been busy and havent been able to look into the other problems i will respond as soon as i can. Thank you for your help

First off i want to say thank you for reading this and giving your time to help me. I Currently have in my possesion a 1993 Lexus ES300 that has a rough idle and a THICK cloud of white smoke that comes from the exhaust. I am in highschool with only $1000 to fix this car. It was given to me by a family member that tried to fix it but was tired of messing with it. It has sat in a garage for two years. Two Years ago it was taken to three different mechanics who all wanted to replace the fuel injectors. Which leads me to believe that the computer is bad. I can order a refurbished computer from allcomputerresources.com for around $200 ...If the new computer does not cause the smoke to stop my next hypothesis would be that it would have to be the Head Gaskets. ( am i on the right track?) Once the computer comes in i plan to run two treatments with Gunk and drop the oil pan just to make sure any build up that was there is gone, I also have a Radiator flush and Fuel System cleaner. After that i will change the rest of the fluids. Then i will replace the Head Gaskets with the help of a friend. ( this is my gameplan please tell me if you think this is the method that would be appropriate, please keep in mind i cant afford a mechanic.) I looked in the Fuse and Relay box and i am Missing 3 Relays and one (not standard size) fuze. I am Missing FUEL PUMP RELAY, ENGINE MAIN RELAY, FAN NO.1 RELAY and ST MAIN 30A Fuse. (family member doesnt know if the relays and that fuse was their when he bought it) The file i have of the car and my family member told me the AC was cold but wouldnt blow like it should, is this because of the missing relay? Will the missing relays effect the car? Is the fuel pump relay causing the computer to keep a fuel injector open hence the white smoke? Is the missing Engine Main relay causing a rough idle? I found most of the parts i need on Rockauto.com including the relays but are they a necessity?( my limit knowledge is from talking to people and reading blogs) Please help me and anwser my questions to the best of your ability. Your anwsers will be GREATLY appreciated.