Why would car die after idling for short period and when I apply acceleration?

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1986 maxima- high mileage but ran great with no fluid leaks. Fuel pressure and fuel pump checked out. Replaced crank angle sensor (complete distributor). Replaced Throttle position switch and cleaned Mass air flow meter and sensor with cleaner specifically for MAF sensor. Checked voltage and ground at connector. The ECU has self-diagnosic mode which consistently shows two codes: load signal and Throttle position switch/circuit. My haynes manual offers no clue as to what comprises the "load signal".