86 720 z24i poor idle and acceleration

[720nissan]

I have an 86 720 4X4 that does not idle well. Once below 1,000 rpm it sputters and stalls. It also surges and has hesitation until about 3000 rpm. Here is a list of what I've done. New plugs, rotor and cap. Checked ignition timing. Installed a new idle switch. Check vacuum hoses and sensors including a new 02 sensor. Computer does not show any codes and returns a 44. The motor is a fresh reman as well. Is there anything I can do to get this truck to run right? Has anyone experienced this issue before? Any help appreciated!