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how do they know that the valves are really tight unless they have taken off the valve cover and let the car cool down. can't even attempt to gauge it unles it's ice cold. no expansion of the metal. your buddy driving it won't help. the misfire you have won't be picked up by humans. its so slight that the ecu is picking it up through the knock sensor. why ask for help if you don't follow it. you are going to spend a lot more money getting it diagnose at the dealership. if you have that kind of money more power to you bro. you've already spent a lot of money already. the non- fouler mod is cheap and getting your valves adjusted is only 1.5 hr labor at most which is equal to 140 bucks at max. you are almost out of options. what else you have to loose?
"you can lead a horse to water, but you can't make him drink it".
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