Hello everyone,
I have a 99 grand prix gt with the 3.8. What is going on, is that when the fuel tank hits 1/4 tank, the car will run roughly, making the Service Engine Soon light will blink and then go solid ON.
I took the car to Auto Zone to get the code read. While he was hooking it up, his was thinking evap code. It wasn't.
It was a Cylinder Misfire on #6. The guy thought it might have been a sticky injector since it is intermittent. Or maybe a plug or wire.
Any other ideas, or should I start with the injector, plug and wire?
And if it is an injector, what's the cheapest way to fix/clean it? I tried the in-tank additive and it doesn't help.
Thanks!