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Answered 2007-02-26 01:41:42

Possibly a vacuum leak, check vehicle emission system, or air intake system. In over 50 years of driving and working on all kinds of vehicles, I have several times seen this symptom caused by various kinds of RESTRICTIONS [or blockages] in the EXHAUST SYSTEM. Some examples of causes found include: blocked catalytic converters, tailpipes bent from backing over an obstruction, exhaust pipes or tail pipes "pinched" from collision damage, and separated/collapsed bulkheads inside of mufflers. There are other causes, but these are all I can think of at the moment.j3h.

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