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This sounds like inadequate combustion air. What is the brand and model of your unit?
I'm going to open this backup to my colleagues so one of them can help. Please don't respond (even to acknowledge this post)until you get a response from us. If you respond first it will only delay your answer.
Hello, I am Phil, Rick opted out.
Tell me please if this is looks like the manual for your unit,
Please confirm, this is an electric furnace, not a gas furnace.
The only thing that will shudder in side an electric furnace is the main blower motor. If that is what you have, turn off the power to the furnace, remove its front cover, and reach inside the blower compartment, insure the power is off and the blower wheel is not turning, then spin the blower by hand and tell me if you feel any roughness in the bearings or play in the blower wheel so that it hits its cowling.
We can go from there.