I had/have the P0301 error. Which to my understanding is a misfire in the #1 cylinder. This is an 02 Sonata. I changed plugs and wires in june of 08 so I thought it couldn't be that. I checked the coils and they read OK, next the fuel injector and it ohmed out good also. I really didn't want to pull the intake again but I did and the #1 plug looked dark. I went to Autozone and got another set of Bocsh wires and he told me the original set of plugs i got would not work which were bocsh platinum plus. He said they couldn't handle the voltage. He told me I needed the plus 2s or the plus 4s so I bought the plus 4s. I took the wires off all at once because I had to trade them in to get new ones. When I put it all back together it is worse than it ever was and I think that maybe I mixed the wires. On the coil pack starting at the front of the car I go 1-4-2-5-3-6 and I know for sure which cylinder is #1, the right side closest to the firewall, I need to know the other 5. I thought it went 1-2-3 across the backside next to the firewall and 4-5-6 on the radiator side of the engine. Anyone know for sure? Thank you in advance.

 

Googled it and found it but thanks anyways. And this did take care of everything, running like a top