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I have a 1982 Datsun 280ZX Turbo that has started to have this problem. It would run steady at 65 mpg, but not respond to any attempt to accelerate other than backfire. It started to exhibit a problem of slowing down from highway speeds, with any attempt to accelerate resulting in it backfiring, unless you let your foot off the accelerator and allow it to seemingly take in the excess fuel before trying to accelerate again. Diagnostics pointed to the need to clean the fuel injection system, and replace the distributor cap, rotor, wires and plugs. When I cleaned the FI system alone, it stopped the uneven fuel issue, and would maintain road speeds, but was still sluggish to respond to quick accelerations once at road speed, and was slow off the line. With the replacement of the rotor, cap, wires and plugs, plus a tune up afterwards, it has restored performance completely.

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Q: 1983 Datsun 280zx turbo The more you push the accelerator the car starts to backfire you have to let go of the accelerator a little bit and it will get more speed What is causing this?
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