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low power


Vehicle Information: Model: 911; Year: 1967; Body Type: Coupe; Engine (type, size, modifications): 2.0; Total Mileage: 100000+;

Hi Ed,Another mystery problem.There is no question that my stock 2.0 engine is getting tired. I had compression and leakdown tests done on it a couple of months ago, and have two cylinders that are getting low compression. that said, the engine was running beautifully, just a little under powered.Last month I rebuilt the webbers, and put in a new distributor, points, plugs, and ignition wires with great results.The engine ran beautifully for a few weeks, but has a new problem, there is a huge drop in the torque so much so that it stalls going up a hill. the engine idles smoothly, and when not under load runs well throughout the full rpm range.When it gets up to full operating temperature, the torque increases.I think I smell allot of unburnt fuel in the exhaust.Is it possible that it could still run well even if there is little or no combustion in one or two cylinders? Any other ideas? I'd love to wait until November to pull the engine for a winter project of valves, rings and chain ramps.

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