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yo, the po420 is related to your misfire, but getting your valves adjusted is a very crucial thing to do. if you have aftermarket cams in the the chances of the valves being adjust properly is slim. the dealership won't do it cuz they don't want the hassle of dealing with aftermarket parts. aftermarket of not it is the same as adjusting stock cams. the reason being is the valves are adjust with the valves close. just ask one of the guys at the shop if they can do it as a side job. make sure the engine is ice cold when adjusting valves. should take about 30 minutes to do once engine is cold. yea sounds like your misfire is at an idle. another problem with putting in aftermarket cams is if they don't do it properly the car will be out of time and you really don't notice it running, cuz they will adjust the distrubutor in advance to make up for it. easy check just look at your distrubutor to see if it is turn all the way right or all the way left. honda dealerships usually get tech support from the engineers in torrence, cali. only if a car is still stock, if not they are on their own. do the $4 dollar thing. then check what i've told you. trust me i know what i'm talking about. i've been a honda tech for 8 yrs. i've seen most of the problems. really sounds like a valve problems. there is also one other thing that will cause these codes but it is expensive to fix it. try this first and back to me. pm me.
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