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Q: I have a d 21 with a TBI 2.4L engine that idles faster and slower intermittenly, on 1990 Nissan Pickup (D21)

and when i go to drive it after i change gears it bucks when i try to maintain my speed. i changed the rotor button, distributor cap, plugs, and wires nothing also tried adjusting the T.B. nothing. whats going on?
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Well i got the engine to properly fast idle and idle normally, now it still bucks after every gear after i let off of the clutch and stay in the same gear to maintain speed it still bucks the temp sensor has been replaced which like i said has taken care of the idle except i also forgot to mention that it has a rough idle not real real bad but noticeable
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