1992 Honda Civic Repair Question
1992 Honda Civic rpm goes real low with ac on.
1992 Honda Civic 4 cyl Front Wheel Drive Manual 154500 miles
sometimes my car stalls when I let go of the gas pedal, but only happens with the ac on. when ac is off i dont have that problem thanks in advance.
Answer
What engine do you have?

soory i forgot to add my car is Honda Civic VX. engine is 1.5z litter vtec-e. thanks.
There is an "idle up" valve mounted below the throttle body that is designed to overcome the extra load of the A/C. Check it and see if there is anything obviously wrong with it.

ok I will & I'll let you know. I appreciate it.
I found that idle up screw with the diagram you sent me. do I have to adjust te screw with ac on?
No, I didn't say to adjust anything. The is a valve mounted below that to bring the idle up when the A/C comes on and it likely has a problem.
ok. is it called the fast idle valve? if so do I need to take out or how would I know it's damage?
Your really going to need some help. Your probably over your head on diagnosing this.