My 1971 Pontiac Lemans 350 starts and runs great in park. As soon as I shift the Turbo 350 transmission into gear, the engine will quickly fade and stall. I can power brake to keep rpm up and get the car moving. Plus it shifts a bit hard from 1 to 2, could this be a vacuum modulator issue?

John Mader

Asked by Apr 18, 2015 at 08:24 PM about the 1971 Pontiac Le Mans

Question type: Maintenance & Repair

2 Answers


or a torque converter clutch.

James Ramond

more like a vacuum problem, intake gaskets or vac hose leaking

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