Misfire and O2 sensor erratic voltage. It can be many things. Don't throw parts at the problem. Take it to a professional.
last one to touch it is at fault!! take it back & make them fix it.
Trouble code P0301 means:Cylinder no.1 misfire detected
Engine cylinders # 1 and # 4 are misfiring
Lean Condition caused by bad or restricted injectors
Trouble code P0301 means:Cylinder 1 misfire detected
In researching other computer trouble codes, I ran across the site that is listed under "Related Links" down below the sponsor links.That site suggests the P0301 code relates to random misfiring on a particular cylinder.
Trouble code P0301 means: Cylinder #1 misfire detected
Trouble code P0301 means:Cylinder 1 misfire detected
Trouble code P0301 means:Cylinder 1 misfire detected
Trouble code P0301 means:Cylinder 1 misfire detected
P0300 is for random engine misfire p0301 and p0305 are misfires on cylinders # 1 and #5 www.lextechautomotivellc.com
Trouble code P0301 means: Number 1 Cylinder Misfire Detected