trouble in paradise, Car stalling, ALL OPINIONS WELCOME Options

[siuformula]

"Little Black" started to misbehave. when i backed out of the driveway, she died, it was early so i just assumed i let the clutch go too fast. i tried to restart the car and nothing happened . Here is what i found after some extensive spark plug pulling. The plugs were shot and corroded. so i replaced them. the car started fine after the new plugs were in. but when i accelerate the car started to stall out between 1000 and 2200 rpm. foot to the floor and nothing!!! i could get up to the higher rpm range and she did just fine. there sounded like a misfire at idle. At this point i decided it was time to change the fuel filter with my thoughts being that there was a fuel delivery problem. the filter was dirty and needed to be replaced but was not the problem. I thought maybe an injector cleaning was in order, that's when i was sure that i found the problem. the entire intake was caked in carbon soot, I've seen chimneys with less soot. everything from the back of the throttle blade to the intake gasket was a thick film of black, 2 days and 1 gallon of mineral spirits later the intake was clean and all of the carbon removed. surely this was part of the problem seing that 2 of the vacuum ports in the TB were blocked. NOPE!!!! After reassembling the freshly refurbed intake and TB the car started and reved great, i removed the car from the lift and took it for a drive, great throttle response, perfect, for about 14 minutes and then the sputter and stalling started again. I could use some opinions here.

[siuformula]

the hessitation and sputter is only intermittent, It is not all of the time. wheather the car is under load or not the car will stall out. but rarely stalls to the point that the engine dies. I can't imagine the plug wired being on wrong due to the fact that they have never been removed from the dist cap and the car revs to redline once i get past the hessitation at 1200- 1500 rpm