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Had the same problem years ago on the Road Runner. It would run all day just fine, but when you drove it like it was meant to be driven, it would set you back in the seats and then all of a sudden it would just give up. Turned out to be that the fuel pump push rod was worn and it would not pump enough fuel under heavy acceleration . Replace the push rod and all is ok. Thanks - 69rrvert



i would agree, but the one thing is that if you floor it at 65mph+, without kicking down, it's fine right to where you just get scarred? i'd think that if the fuel pump could keep up with that, then it could keep up in a lower gear just higher rpm's. ???

One thing that makes me think it's not a fuel issue, is that it's instant, not like it slowly starves for fuel, but just an instant drop in power, motor boggs/surges, like it instantly runs on 4cyl's, does it about 60% of the time. but when it works it works, pulls right to 5000rpms or so and shifts, no issues.??? this one has me stumped.