Hey guys, so recently my 99 started running rough after the battery died. I figured the plugs hadn't been changed in ~118K miles so I'd start there. First thing I noticed is that while they were NGK, the old ones only had a single hook to them. The new ones I got were model BKR5EKB-11 and have two prongs.

While changing them out I noticed that the rubber hose/coupler connecting my throttle body to my air filter box was eaten away and had a large hole in it.

I drove the car after changing the plugs and after a few mins it started acting rough again. I remembered the hole in the hose/coupler so wondered if it was maybe that and decided to get an airaid tube figuring it'd also make changing out plugs easier in the future with the stock larger tube gone. Finally was able to install it and unfortunately after a bit of warming up and giving me some hope that this resolved the issue it finally started acting rough again.

I finally decided on using a ODB sensor and found that it was throwing a P0302 which is a Cylinder 2 misfire. Frustrated I cleared the code and on the freeway the CEL started flashing, slowed things down and it stopped flashing but didn't remain on. I finally got home and checked again only to now get a P0300, P0301 and P0302 code. I know for sure I have a P0302 since that code had been on there for quite some time, would the other two be false reads since I'd just cleared the codes?

In any case, what else would I be able to do to try to resolve the problem? I'm thinking I should maybe buy some wires since those were also done 118K miles ago. Other than this airaid tube it has no other engine mods. Any other tips?

I would run a quick compression test on the motor just to see if the motor is 100%

I’d do wires first and coils second.


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I thought he replaced it and still got the missfire?


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Correct, replaced it without fitment issues.

you are right I should have read it more closely.