ok few things bought an ef drove it from echuca to melbourne sitting on 100 kms it will now and then sort of back fire? when its idling it will have a slight miss as if its running rough i put a 2.5 exhaust on with a single muffler its running better but not 100 percent if its in gear it will sort of jump slightly , not realy rough but slightly. its an auto

the other problem is my dads el also auto when you take off and its cold 1st to 2nd gear change is pretty hard once it heats up it slams in to gear so much so that you have to anticipate it and change how much your giving the car

any help would be greate!