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Engine starts and idles fine but once it warms up and I bring it up to cruise speed...around 3,000 rpm - it starts to sputter. RPM's drop by 300 - 500 and it bogs down, even if I open it up, she stays at the sputtering rpm's. Then after about 20 seconds of sputtering, it returns to normal...

Does anyone have experience with using Sierra's Exhaust Manifolds & Elbows ? It's about time I replaced my setup and I got burned by using Osco's a while back....couldn't keep salt water out of the cylinders. But I've had good luck with other Sierra parts and I wonder if any of you have used the...