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Q: have cyl 2 4 6missfire at steady speed only does great under load and idiol has on 1999 Toyota Avalon

new plugs wires fuel filter igniter box and injectors cleaned still no better and the old plugs looked good and did smoke test no vacume leaks and good fuel psi an volume any ideas
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Wow you have cover all the basics. That engine has "shim" adjusted valves but it could cause a misfire on various cylinders but all your misfires are on one bank. What are the fuel trim figures are the different on each bank? I would have thought a vacuum leak at the bank but you did a smoke test so you have illuminated that. O2 sensor can affect just one bank. I would love to know what you find. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate
There is a professional service called Identafix. They only deal with professional repair shops. They are in the Minnesota 651-633-8007 begin_of_the_skype_highlighting 651-633-8007 end_of_the_skype_highlighting. Your auto repair shop do all their diagnosis tests, and discuss your problem with a team of professional technicians great service cheap and very bright people. If the repair shop that are repairing your car are stumped this is a great service. This company only deal with automotive repair shops and don't answer questions for the general public but are an amazing knowledge base.
.check exhaust back pressure on that bank, BEFORE cat, have had to replace several. also check for vvti solenoid i applicable
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