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surging idle 700 1989

Were you able to check the timing w/ a strobe light? I believe it should be about 10-12 deg BTDC for the #1 plug at idle. Also check for a leaking fuel reg vacuum line. Could be dumping gas into the intake manifold. If you have a Mitsubishi turbo check the end of the hard plastic tube going across the valve cover. Mine split where it attached to the flame trap. Hard to see unless you remove the tube.






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