can anyone tell me what I need to do for a tune up on my 04 mpv. my engine is missing alot and sucking down the gas, so I had the parts store put the scanner on and it said plug #3 is miss firing so I figured to just do a complete tune up. thanks mark

 

Get an owner's manual, or even better, a shop manual. Depending on your mileage, your troubles, and prior maintenance history for the car, sort out what has to be done, who is competent to do it, and make your own call as to where to go from there.