don't know how much help we need yet, but my father is driving a TR6 that he just bought back from New Orleans and he is bogged down in Athens Alabama tonight (10:30 PM CST). She ran smooth until a gas stop 30 miles ago and now it bogs out in 4th gear and "spits" and "pops" in 3rd. He plans to check the plugs, fuel filter, and vacuum lines in the AM. Any other suggestions? Anyone no someone in the area that may be able to help? My dad worked for AC Spark plug/Delco in the 70s and is comforatble with engines but we all know how "unique" LBCs can be. We'll know more in the morning.