Is this a new engine or a used one? <div>I had a very similar problem with the same engine, which was caused by an air leak. The engine was heavily used and was picked up for free at a yard sale, however, so maybe that had more to do with it....</div><div>
</div><div>Does the engine idle well? </div><div>This could give a hint as to where the problem originates from.</div><div>
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