Keeping it going problems
It is possible that you have a vacuum problem. There could be hundreds of other causes, but start at the beginning and check for a perished rubber vacuum pipe.
Vacuum leaks could also occur between the carburetor and the intake manifold, but on a '86 model, just for fun check the play on the butterfly valve shaft.
Your car is 28 years old, and the butterfly shaft tends to wear out from years of acceleration and deceleration (throttle valve movement). If you do find excessive play on the butterfly shaft, you probably need to have the carb overhauled, or possibly less expensive, have it replaced.
SOURCE: where is the fuel pressure regulator located
its at the rear of the fuel rail has a small vacuum hose goig to it ? suggest going t oadvance.com and type in your year make and model and "fuel pressure reg" it will show you a picture of it might help?
SOURCE: I have a 1986 Nissan Pickup D21 that bogs down
your carberator is gummed up. Go to the auto parts store and get a can of seafoam fuel additive. Read the label so you get enough but as I recall you put in one ounce per gallon of gas. Run that through your pickup for a few miles and it will purr again.
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