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after driving for a while, it needed a new head gasket, so an upper rebuild had been done. Now the idle on the car bounces between 650 - 800 rpm. Used to stall out when put in park. When checking spark plugs, it was noticed that the car runs at 1000 - 1200 rpm steady with only 3 rear plugs.. Add front three and drops down and bounces. If anyone can help it would be greatly appreciated.