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Have had an 87 GN, 63K, for the past year. Basically stock with a few goodies. Love the car! But having a sputtering engine. More like a "bucking bronco". Even with engine warmed up, it will buck. Seems to hover at about 35mph when it does this. Will improve as car warms up but has done it at optimum temp. Anything I should start looking at? Injectors? O2 sensor? Any help I'd sure appreciate!
 

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Might have a bad spot in the TPS sensor. You can check buy using a dig. multimeter with a bargraph on the bottom and look for spikes in it as u open the tps to full throttle

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First check for codes: http://205.147.64.51/maint/malf.html#TOP
If you get a code make the correction for the code if not I would look at the following.
The problem could be a number of things.
Does the car idle smooth?
Does the hesitation come in only at 35 up?
Can you tell if it appears to be fuel or ignition related?
If it is fuel - how long has it been since the fuel filter was changed. Have you upgraded the fuel pump? it could be the fuel sock is going bad.
If ignition - I would then borrow a coil pack and try it.I would look at plugs and wires.
 
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