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Hello, usually this concern can be found with low oil pressure. The first thing you want to do is manually test oil pressure with a gauge. At hot idle when it is acting up the oil pressure needs to be at 25psi. It oil pressure drops below 25 psi the engine will run rough due to improper timing. If you have less than 25psi it is going to be a base engine concern. If you still have 25psi then you problem should be fixable. To test oil pressure the gauge plums into the engine oil temp sensor by the oil filter.
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