Just a thought, mine was hunting up and down at idle and would buck on start off until the rpm got over 3000 the engine just didn't want to go. Come to find out my actuating diaphram for the intake was not working due to the vacuum line being fused together. You can see the diaphram under the thermostat housing on the drivers side, so if you get someone to start your car while you watch the actuating mechanism you should see it move. Like I said just a thought.
