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Q: rattling and more on 1990 Nissan Pickup (D21)

sometimes when im driving it kinda feels like the truck pulls backwards or rocks back... also it rattle sometimes with the rpms are coming down or in idle.. it was idling at 1700 rpms but normally it idles just below 1000. any ideas at what could have caused that?
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i had this same problem it was the rod berrings at the crankshaft after about six months they finally went out but if u do an oil change and pour a court of lucus oil stabalizer in it first then fill it the rest of the way up with rotilla 10w40 motor oil it will quit and last u a long time i tow around 10.000 to 12.000 lbs on a daily basis with mine plus a big dog tandem axle trailer thats why mine only lasted 6 months but urs should last 3 times that long but dont worry u can change the rod berrings just by pulling off the oil pan then thair right thair easy fix and the lucus will save your crankshaft from gettin tore up it took me about 5 hours to change them and they only costed me $18.00 at import parts thay were cheap u can look them up online at hope this was helpful good luck 2 u man and if u need anything else contact me at p.s. I put a stage 2 turbo in mine from a mitsubishi 3000 gt now its the fastest nissan in southern oregon
the o2 sensor is bad the same thing happened to mine it feels like it kinda the truck pulls back when you have the gas to the floor
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