THE 91 NISSAN STANZA idlesreal good but when you press the gas it goes fast then slow then fast and slow again will not run smooth
could be clogged fuel injectors, fuel pump, fuel filter
first what I would do is clean fuel injectors and replace fuel filter, if there is no codes, meaning your check engine light is not on, some times bad gas can do this or water in gas, better to try the easy things first, plus they real dont cost.much, now I use Lucas fuel injector cleaner myself, I have always got good response from it, plus if need to, you can put a tube in every day, thats if you use about 10 gallons of gas everyday
so.try this first, cost for Lucas is around $6 also change fuel filter, cost any where from $7 to $25
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