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Check the EGR, and the PCV valves.. they can also cause this.. In my 88 that i had it did something sounding a lot like what your problem is.. and it turned out that both were bad..
Or else i know that my 1991 had the connector come off of the TPS sensor and it also did this. But is the check engine light on?
Or else i know that my 1991 had the connector come off of the TPS sensor and it also did this. But is the check engine light on?
