check your electrical connections. You could have interference if the maf, or in the o2, or possibly the distributor. check resistance on all wires. These should all have sheilding on the wires. if there is a break in the sheilding that could be causing your problem.
1995 240sx SE RB26dett, JE pistons .5mm over, HKS GT2510 turbos, OS Gieken twin plate clutch, HKS 720cc injectors, Aeromotive FPR, Greddy intercooler, custom 3" aluminum piping, Mines dump pipes, Custom Horstman downpipes, Greddy 4" cat back, Greddy Profec e-01, Greddy e-manage, Recaro leather SPG seats, 300zx brake upgrade, Aeromotive tsunami fuel pump, koyo aluminum radiator, energy suspension master set, And one REALLY f*&%#@! good ALARM SYSTEM