Trust me, I had to go through this engine cause the previous owner overheated it and warped the head. I have never let this engine over heat, it had tried to come close when I first got her on the road, but it never did. It was a cold morning and all of a sudden the heater wasn't blowing very warm air, and I looked at the temp gauge and it wasn't warmed up. Went to replace it a couple of days later, and that's when I discovered the crack, and it was JB welded back into service. Fuel filter was replaced about 3-4000 miles ago, and I have plenty of gas, and once I remove the load from the engine, it sputters back up to rpm, and clears it self out, and this is not driving, this is just trying to load the engine more so it warms up a little faster. I plan on converting the car over to a manual before to long, so I don't really care about this auto trans. I have check the choke, it fully opens, however, on the secondary side of the carb, (by the way, it's the factory Hitachi DCH 306-63) the carb looks to be drenched in gas. and it doesn't dry up. Also, I played with the carb and most of the issues went away, except it back firing through the carb when I'm pushing the car, like I would to merge onto the highway, or to climb some of the mountain roads we have around here.