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Vehicle Information: Model: 911T; Year: 1973; Body Type: Coupe; Engine (type, size, modifications): 2.4 Liter with stock MFI; Total Mileage: 145,000;

Lots of smelly gray, with possibly bluish tint, smoke comes out of the tailpipe for a long time after starting - sometimes 50 miles are driven before it stops. Sometimes it stops after a few minutes. Next day the smoke starts up again, but not always. Valves were changed at 72,500 miles and air box replaced a couple of times before spring-loaded valve was added to solve that problem. Oil tank was replaced in ''84. Nothing else was done to the engine, which seems more noisy than it used to be, but has plenty of smooth power. How to eliminate the embarrassing smoke? What cost are we looking at?I''m the car''s original owner and only driver. It''s still in great shape, though not used much anymore.A second symptom, related or not, is bucking at low rpm when trying to keep steady slow speed in first or second gear in traffic. Gas mileage is lower than it used to be, either. A local mechanic adjusted the fuel mixture several times during the past few years but hasn''t hit on the right balance between rich and lean. Another readjusted the timing, after which the engine ran better but still not like it used to.

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