Tank problem usually shows up in lower gears where you are pulling the fuel away from the pickup. By the top end of third the gas should have settled back down, but this does sound like a fuel starvation problem. Tell us about the electric pump you tried and how it was plumbed in. Normally too much pressure screws up the idle with fuel spilling over into the venturies. Also, since you can get right back on it and it picks up would go against the too much pressure theory. If it was excess pressure, getting out of it would probably flood the engine and it would really sputter along when you got back in to it. So it still sounds like lack of sufficient fuel at the top end of third.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 Catalina Safari Wagon.
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