seafoam made the misfire worse? I also switched the plugs/injectors and it did nothing so wen home and seafoamed and now the motor shakes likes crazy and im sure all the sea foam is out because i drove it for a while after to see if it would stop even put some 91oct fuel and still misfires. One thing i did find while seafoaming is there is a small exhaust leak on where the header meets the exhaust. It looks like my long arm has crushed in the up pipe and made a small leak but didn't think that would cause the misfire?

 

Seafoam made it worse? I know the last time I did it, it ran rough for like 30 minute or so of driving.

Also, don't run 91. Octane ratings indicate how hard it is to get the fuel to combust, with 91 being harder to combust than 87. Probably not related to your problem at all, but all your doing is burning money.

 

Yeah I sea foam my other car ever other oil change..VW FSI GTI. (direct injection) lots of carbon and am used to the after part of being weird for a little bit. However this time it did not change it ran like there was sea foam still being poured in an hour or 2 after driving it and getting all the smoke out. After starting it this mornign and letting it run for a bit it still was doing the same then on a drive around the block. I will do one more test recomended to me by a member on NAXJA and then after that i will take it in and let you guys know what is found.

 

Did compression test all was fine. I changed the spark plugs and a new 02 sensor and it seemed to have fixed the issue. Thanks for all the help and quick responses.