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Originally Posted by MudPaw
I have an odd problem. I noticed yesterday my quest shuddered (more of a motion rather than any sort of noise). Think of someone coughing repeatedly and the jerking that it involves-that's the best way I can describe it. It wasn't doing this violently, but to the point I immediately noticed it. It does this at about 25-45 mph ONLY when I push the accelerator, never otherwise. This is the first van I have ever owned, so this is all foreign waters to me. I've only owned Japanese compacts before now. So, any ideas what on Earth this may be?
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Is the check engine light on?
Have you checked the basics like distributor cap condition, plug wires, spark plugs and fuel pressure with a fuel pressure gauge along with the fuel pressure regulator?
Another possibility is the camshaft sensor.
To me a coughfying condition usually means a fuel problem or timing issue.
Start with basics and we'll go from there. Don't just throw parts at it without doing some testing first.
Send me a PM with your email address and I will send you some info.