This is usually caused by an exhaust leak (allowing air into the exhaust) or
by a faulty thermactor system. Is the air pump hooked up an the vacuum lines
intact? This may be difficult to diagnose at a distance with someone
unfamiliar with the system.
How do you get heat shield out of thermactor??? I suppose I could have used
a more Fordly term such as AIR system but what the hey?
I know a few people that would love to have some of what you're smoking...
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