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my 97 grand prix gtp stalls while driving down the road. it happens at hwy and city speeds. I can sometimes restart it while coasting down the road right after a stall. other times I have to wait a few minutes until it will start. I have had it hooked up to a scan tool and the error code was misfire cylinder 4. I have replaced the spark plugs and spark plug wires. I also replaced the vaccum line that has to d0 with the fuel pressure.
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Usually only uses a 10mm socket, but it sounds like you need someone else to diagnose this car.