I have 86-125/4cyl every time i start the motor i get like a small hickup or back fire through exhaust and on the next turn of the key it fires right up and runs great, not that big of a dill but it is bugging me and i know that it is not right, 2nd problem it seems that i am gitting steam out of exhaust at idle in gear, is this normal or do i have a problem i need to address!!!!!! Thanks for any help