Forgive me for the long read...just trying to be as descriptive as possible... I rebuilt my Rochester 2-Jet recently due to it running rough. It wasn't in bad shape. I set everything to the exact specifications that were listed under the carb part number (motor/carb is from a '77 El Camino with 305V8) I bottomed out the two front metering screws, and backed them both out 2.5 turns (I read that somewhere on here) I started up the motor and it ran perfect. I adjusted the idle, and it has been great. The truck had some old gauges in it and I was leary on their calibration so I placed an order to Jegs and bought some new gauges. Along with those, I wanted some "tuning" gauges, so I bought a liquid filled direct mount vacuum gauge, a liquid filled direct mount water temp gauge, and an inline fuel pressure gauge, also liquid filled. About 2 weeks ago I mounted the fuel pressure gauge in the rubber line just before the carb inlet fitting. It's reading 7-8psi!!! It has a bone stock mechanical pump, 3/8" aluminum line from tank to pump, 3/8" hard line from pump to carb, then it has a few inches of rubber 3/8" ID line to a big clear plastic fuel filter. It was running fine, so I just assumed "whatever" about the fuel pressure and kept driving it. It has been fine since the carb rebuild almost a month ago...no other mods than the gauges. Everything seems tip top. I have a steady reading of 20 on the vacuum gauge, timing is set perfect, no vacuum leaks, plugs are reading fine. Then yesterday I drove it about 10 miles...parked for about 45 minutes, then went to start it up and it would crank and crank, finally try to fire off and then cough and sputter, smoke a little, then finally clear it's throat. It ran fine after that. I drove another 30 miles, parked it for an hour, and it did the same thing...then again after 45 miles, then again after 15 miles, then again after another 40 miles. This all came out of nowhere...it has always been an easy starting motor, even when hot. But once it fires off and clears out...it idles fine, and runs fine. I even calculated my fuel mileage after yesterday's driving, and I was getting 18mpg, which is average. WTF is going on? I'm assuming the fuel pressure has something to do with this. It must be pushing the needle up off the seat and flooding the carb after the engine is off. But why out of nowhere? Why all of the sudden? I'm sure I need a fuel pressure regulator, but why would it be fine all this time...then out of nowhere start acting up with no changes to the entire system? I cranked it off this morning to run into town and it started right up, but after a 5 minute stop...it cranked & cranked and cranked til it finally fired off. Cough, Spit, Sputter, then it roars again.