yamahadude157
New member
Hello i have a 1998 buick century with 3.1 motor. The car has sat here for 3 years without being used. It ran great when i parked it 3 years ago. Now i'm trying to put it on the road but its running poorly and giving me a code of p0306 on my scanner. It idles ok but if you accelerate in neutral it stumbles if you try to drive its much more noticeable under load the hole care shakes. I have changed the plugs/wires and fuel filter and it hasn't improved. Im wondering how you go about testing the fuel pressure and how to check the coils with ohm meter ? any help would be greatly appreciated i cant afford to throw many more parts at it.