Put in drive car surges. Never cuts off just surges. on 1998 Audi A4

Car will not go over 20. Car sat for a month and had to be jumped. Never surged until then.

Asked by for the 1998 Audi A4
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I think some kind of animal made a home in your exhaust system.take out one of the o2 sensors closest to the engine then drive it.this will most likely turn on the check engine light and it will be loud but it will confirm or rule out any exhaust restriction