I have a nissan B-14 sunny 1994 model automatic 1500cc (i think) my problem is it keeps having a flat spot,it will drive ok then it faulters for abit then will drive ok again,i already changed the throttle body but it still not right ...any ideas?
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check that the idle circuit solenoid is operational if this has a carby. If not run the fault codes but it sounds like run on by fuel going to the cylinders and being ignited by hot bits in the cylinders.
Auto boxes are best left to professionals but there are some things you can do 1) check that the selector rod from beneath the gear shift to the gear selector on the side of the gear box is correctly adjusted, 2) make sure that the transmission oil is at the right level, new oil can be added via the dip stick tube. If you are adventurous and are able to remove the gearbox pan you might be to see evidence of the gear box damage, metal shavings etc. If you can remove the gearbox you may be able to replace a sheared splined input shaft (indicated by a an engine that is running but that will simply not engage gear). Anything repairs beyond this should be left to an expert or simply replace the gearbox
if you have a MAF sensor in the air intake system, clean the wires gently with carb cleaner spary and a toothbrush. Disconnect battery for 2 hours. Reconnect and drive for 10 miles till computer relearns clean sensor. may drive rough during this drive.