Ok here is the quick story. Over the winter I installed bbk longtubes. Today was the first day that I was able to get it out. I took it for a short 6 mile drive. It ran great with no problems. Brought it home and changed the oil and put in a 180 thermostat. Started it back up to check for leaks. It idled fine for about 3 mins and then all of sudden shut off. I restarted it and now it doesnt want to idle right. It will idle ok till i rev it up, then when the rpms drop back down it either stalls or almost stalls. If it doesnt stall then the rpms will go up to about 2 grand and then it drops till it almost stalls again. Repeats that about 4 times then it will idle ok till i rev it again. Has anybody else had a problem like this?