i35

I recently got oil changed on my Infiniti I35 using a Groupon from a new auto clinic where I went for the first time. I use a regular/standard oil change. After the oil change, i also used the the techron gas additive when the gas tank was almost empty and filled 15 gal 87 gas from shell. This...

I have a 2002 I35 and last month had a bad coil replaced along with all the spark plugs and also the gaskets and valve covers. I spent a lot of money getting this work done, now I still get a check engine light and error code p-0507 which is idle control. The car never idled high before like it...