When the old tank was on, I would drive to work (25 min drive), then when i would get off the exit and make it about a mile down the road, my temp would rise and i would give it one good punch on the trottle while in neutral and it would go back down to normal, but since i've changed tanks, no problem like that, one had maybe 2 instances where i felt the car may have mis-fired, but i wasnt looking for it and honestly wasnt paying attention to the car itself to "catch" the feel of it when i thought it might have mis-fired. spark plugs were just replaced last week as well just as an FYI (well after the couple times i thought it might have mis-fired). this much smoke shouldnt come from the car when its first started and then go away after a couple min.
