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While the car is on jack stands, check the drive shaft center bearing and U-joints. Also, check the condition of both halfshafts/axle shafts.
Check for possible vacuum leak. Make sure the vacuum hoses are connected and in good condition. Also, check electrical wires and connectors. Make sure they are not loose or corroded.
Check the clutch switch, on the clutch pedal.
It may be the ECU/ECM is bad. Check for spark and fuel pressure at the fuel rail.