My truck is missing when you run it at 2000 rpm. If you run it a little faster or slower it doesnt do it.It is giving engine code 1309 misfire detection disabled. I have seached only thing I have found to be linked with tha was the camshaft position sensor. I replaced it and the problem is still there, missing at about 200 rpm which is running about 70 (my usual highway speed) so it really sucks. Anyone have any ideas on what to check next??

 

what year and engine?

 

Oh sorry its a 1999 F150 supercab with the 5.4