Glad to see you found the problem and solution BUT were are the exhaust fumes coming from. Sounds like you have an exhaust leak if there are fumes coming out somewhere besides the talepipe. With the engine running loisten and feel for exhaust leaks. You can feel puffs of air if there's a leak. Good Luck.
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Joshua Harrison
1968 912 Coupe
www.geocities.com/jkh912