Erratic idle and die?

1986 NISSAN HARDBODY
158,000 MILES
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DOONER881
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i have replaced the computer under passenger seat (corroded terminal) i have replaced the injectors, plugs,plug wires, fuel pump, and sensor on side of throttle body. truck has sat for 1-1/2 years, it had 1/4 tank of gas in it during this period. after i replaced everything and got it running, it was smoking kinda bad i put in fresh gas and lucas treatment, it no longer smokes bad. truck will crank and run as long as i play with the accelerator. but once i let off the gas, rpms jump from 300 to 1400 about 4 times, then it dies. please help, thanks!
May 24, 2012 at 6:00 AM
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DRCRANKNWRENCH
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Sounds like a fuel management system issue or a clogged intake or exhaust ract. The Idle Air Control Valve Colud be at fault as well.
I would check the fuel pressure first and replace the fuel filter. Then check the intake and exhaust paths for blockage.
May 24, 2012 at 6:12 AM