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<div>Thanks everyone for the replies. I will inspect the pipe to manifold and manifold to head to see if anything is loose or any leaks apparent in the morning.</div>
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<div id="AppleMailSignature">I actually went down a main jet 145 to 140 and that seemed like it helped some but didn't clear up the issue (which is going leaner; opposite of what Greg said). </div>
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<div id="AppleMailSignature">It is missing and backfiring when I am full on the gas. I can prevent it by easing into the gas.</div>
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<div id="AppleMailSignature">I did notice some gas at my air cleaner to velocity stack connection. I wonder if it is a float issue?</div>
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On Oct 15, 2016, at 7:35 PM, Greg Blake <<a href="mailto:gblake58tr3@icloud.com">gblake58tr3@icloud.com</a>> wrote:<br>
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<div>Don't know if my other email made it to you. Backfires on deceleration can be a lean condition. Have you checked your plugs? Maybe something got "adjusted" with the bump. <br>
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On Oct 15, 2016, at 12:27 PM, D V <<a href="mailto:explore8@outlook.com">explore8@outlook.com</a>> wrote:<br>
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Begin forwarded message:<br>
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<div><b>From:</b> <<a href="mailto:explore8@outlook.com">explore8@outlook.com</a>><br>
<b>Date:</b> October 15, 2016 at 10:30:51 AM CDT<br>
<b>To:</b> <<a href="mailto:fot@autox.team.net">fot@autox.team.net</a>><br>
<b>Subject:</b> <b>Stutter at 4K rpm</b><br>
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<div><span>Two races ago I went off track and bent my exhaust pipe enough to break the welded joint near the muffler. In the interest of time, I cut the exhaust at the muffler and secured the pipe to the frame.</span><br>
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<span>At the last race, I noticed the car would backfire at deceleration which I am not surprised but I also noticed a stutter around 4-5k rpm.
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<span>At NOLA this weekend it is more pronounced and comes in when shifting hard from 3rd to 4th. After 5k, it clears up and pulls normally.</span><br>
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<span>It doesn't seem to be affected by turns and more related to full throttle vs easing into the gas.</span><br>
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<span>Backpressure from the loss of muffler or unrelated issues?</span><br>
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<span>1300 spitfire with single Weber 40.</span><br>
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