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Hi, my name is***** it the cylinder head gasket that was replaced or just the valve cover gasket?
Ok, it is not unusual for the front upper timing cover to leak on this motor. The cover was resealed when the head gasket was replaced but it's easy to get the gasket installed incorrectly. I'd be rechecking for leakage at the upper timing cover. The front crankshaft seal and oil pan gasket and the timing chain tensioner are other possibilities. As far as the lump idle is concerned I'd be checking for intake leaks at the manifold. There are a lot of possibilities for lump idle. Intake leaks are most common but incorrect fuel mixture or an ignition problem are also possibilities.
Let me know if you have any questions.
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