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.

[trdproven]

in addition to getting those corrected, do a complete tune up