This is usually cause by a vacuum leak in the fuel tank evaporative system.
I think your problem is either in high voltage cables or in the ignition coils. Since you have two ignition coils for 4 cylinders and missfire in one, the problem is in the cables.
autozone.com is a great sight for repair guides and online manuals.
Take it to a place that does free check engine light check. Some will reset it after they check it for you. Place in New York State are listed on http://NewYorkForum.us
no
my check engine light is on on start up truck runs great after wormed up runs rough
A great place to read information about check engine codes is in books created for automobile mechanics. There is some information provided on YouTube and on various websites, but in order to find out what the check engine code actually is, the automobile will have to be plugged into a diagnostics machine or a portable diagnostics reader.
Something is wrong if the check engine light is on. If the engine is running great then there is no great hurry to get it fixed but there is something wrong with the emissions system or the light would not be on. It is your choice to fix it or not. It may never cause any problems and it could damage the O2 sensors or the converter depending on what is wrong.
2 blue connectors under passenger side dash. one has 2 pins one has 3. use a paperclip to connect the terminals in the 2 pin connector together then turn key to run position (don't start engine) observe check engine light for long then short flashes to get trouble codes. found a great site called batauto.com with info on how to retrieve codes and code definitions
You can check the Internet for information about them. Google is a great search engine to use, and so is many others.
Have a mechanic check the O2 sensors. If one is out then the computer will give the engine too much gas. I have also seen some sensors go completely out and the check engine light does not come on.
Bp i believe is great used hess, getty, sunoco and engine would knock like crazy. Also my check engine light would turn on with the others...
I have the check engine lite on, it states P138 Code, which is Variable Camshaft timing control slenoid. I have no engine performance issue, the engine runs great. like the day I got it new. How do I fix this problem?