Ok i have a 90 GXL N/A, the car starts fine u can drive it around but once it gets warmed up if u stop at a stop light or u park, the idle will pulse like from 400 or less to like 900, but it wont die on me, it justn sits there and goes up and down, what do u guys think about this.

thanx Justin

 

That would be characteristic of a vac leak.

-Joe

 

a vac leak, ok one more question how do u check for this, and would a vac leack have anything to do with , and air conditioner bogging the engine down

 

If the zoom zoom is short cycle (1 second or less), look for a vac leak or stuck AWS or ABV.

IF the zoom zoom is long cycle (2 or more seconds per cycle) look at the BAC or TPS or grounds.