Misfiring after replacement of spark plugs and wires If it wasn't misfiring before. Im gonna take her out on the hiway in about 15 min cause I have to get the comp settings for an inspection and header install on Mon. If an O-ring or end cap is missing, look in the intake manifold for the missing part. It turns out 2 started misfiring also but it went out completely. I was having 3 misfire also so I read this ford escort misfire.
p0304-misfire-can't get rid of the code-
If it is dry you have an injector faulty. If not, look for an open circuit in the brown yellow trace wire from the ECM to the injector. Evilgenius68 answered 2 years ago.
Ecm is by far the easyist. Put voltmeter on 3 inj. If it still happens after that, repost.