Chicago area Tuner

[Bsbuggs]

Good Morning
I have a 14 Roush with JDM tine.. love the tune... but have been getting the P0308 code on and off for about a month. I cleaned the throttle body rtear well... It was super dirty, and that seemed to help for a month... I use Costo gas, but I'm not sure if that's an issue...
Just want to get rid of the code.. when I do see the check engine light start to flash I back all the way out of the throttle and sometimes is stops blinking, sometimes no.
I clear the code wit the SCT and truck runs fine as long as I don't load it up

So in short looking for a good shop In the Chicago area that is great with ford supercharged engines.

Thanks

 

[mprice1234]

Costco gas is a top tier gas, so I don't think that's an issue. I would start with this. Ford code P0308 means that cylinder #8 is misfiring or is randomly misfiring12. This is an OBD2 code and is typically caused by bad spark plugs, plug wires, or coil packs2. Start by checking for intake leaks and if no leaks are found, the next step is to replace the spark plugs on cylinder #8. A shop shouldn't be hard to find with Google and the internet.

 

[Bsbuggs]

Costco gas is a top tier gas, so I don't think that's an issue. I would start with this. Ford code P0308 means that cylinder #8 is misfiring or is randomly misfiring12. This is an OBD2 code and is typically caused by bad spark plugs, plug wires, or coil packs2. Start by checking for intake leaks and if no leaks are found, the next step is to replace the spark plugs on cylinder #8. A shop shouldn't be hard to find with Google and the internet.

Thank you, this is a new truck to me. Old owner replace spark plugs and coil packs about 10k miles ago, that’s why I am kind of stumped. Thanks for the info.

 

[Bsbuggs]

Additional—this seems to happen only with a tune—I have the JDM 93 time and the stock roush—-

 

[Nex]

Explain the driving conditions when the light comes on.

 

[Bsbuggs]

Thanks
Lets say getting on the freeway... 3/4 throttle hitting 5000-5500 rpms.. get a studder then the check engine light flashes... I back out of the throttle and the light MAY stay on or it just goes away.
Always check with the SCT and get the same P0308..
It has plugs, wires coils about 10K ago..
Tuine is JDM
Now when I run the stock Roush tune no issues.