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I want to thank everyone who helped me with my problem on this 4.2 engine.
I finally pulled the valve cover and WELLA No. 3 had a valve spring broke. Everyone I took it too could not figure out the problem. For 10.00 its fixed. No need for a new engine saved 3000.00.
I have a MISFIRE code, from the Auto Zone meter, engine light on again.
New wires, new plugs, new coil. It has a slight hesitation at take off and yes it does miss at 40 to 60 mph.