I recently overhauled the 4.2 engine and carbs, including new needles. Compression is 150 in 5 cylinders, 110 in one, but it is improving as the new rings settle in. Timing advance reads as prescribed. Car runs very well at low rpm. No detonation, no pre-ignition noted in driving or shut down.
BUT - When I floor the gas pedal, with rpm’s going beyond 3k, I can feel a definite loss of power - or at least a failure of the car to accelerate beyond the 3k speed. It is as if it gives me all it has up to 3k, then fizzles out and additional throttle opening yields no additional power output.
Any suggestions would be appreciated