What is your question?
it doesnt misfire often, but when it does it runs rough and the gas mileage is less even when it isnt riding rough or making the service engine light blink,
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Cylinder #1 is right front.. If you have been driving it with that light blinking or flashing,then you are probably going to be putting more than just a coil on it. sounds like you have a random cylinder misfire or multiple cylinder misfire and if so,then it's very possible that raw fuel is being dumped down the exhaust manifold and will DESTROY a Catalytic Converter(s) in no time,and depending on if it's 2WD or 4WD,add $1000.00-$2000.00 extra...