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if it smells like gas then your running rich, if not it's probably oil. what worries me a little is that you mentioned it smells like a lawnmower. I believe, correct me if I'm wrong. Usually if it's the seals you would have this issue until the engine warms up. but in this case it sounds it happens once the engine is warmed.
have you pulled your spark plug out to see if all of them are black or has excessing burning? or just one of them? this will allow you to determine if one of the 4 cylinders is the culprit or it's more the fuel delivery system that's making your car run rich or maybe the oil is leaking from the seals for the t28?
another thought.... are you Blowing off in to the atmosphere? or recirculating back in? is there any popping sound when this happens? are your just sitting there and reving the engine for 5-10 minutes?
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