Jumped in the truck the other day and started down the road and it starting running really rough... Then check engine light came on... Took it and got it scanned and it was cylinder #6 misfire. But the running rough went away on way to store. Started it tonight and light is still on but it runs fine... Where should i start?

 

Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression

 

Did he erase the code?

 

It could be the distributor, but is a flat top. Can you remove it and check for corrosion? It may be best to simply replace it, or it is likely to be a dirty injector. The only other possibility is a weak or broken valve spring for the #6 cylinder. This can cause a misfire at higher rpm. Removing the passenger side valve cover and inspecting the valve springs will let you know if this is the cause.

 

Ok. Thanks guys. He erased the code and it came back on last night. Ill try and check the distributor soon. The misfire seemed to be at low rpms... Justvweird that it went away

 

Ok. Thanks guys. He erased the code and it came back on last night. Ill try and check the distributor soon. The misfire seemed to be at low rpms... Justvweird that it went away. Another thing i have replaxced two o2 sensors in the last 6 months.

 

Did you ever get this issue figured out ? I'm having the same problem and have switched out everything but the distributor, coil pack and have not checked the valves....