new wrinkle on famous idle surge problem

ASSISTANCE Stock Engine-Bay Components
1

I’ve been fighting w the surging idle on my 90 teg for awhile now: chkd for vacuum leaks (none), sprayed out the IACV which is in the EACV, bled the cooling sys several times…still surges.

But today, while the A/C was on, guess what?..no surge! just nice steady idle at 1500 rpm. Turn A/C off and surge begins immediately.

Does that give anyone a hint as to the source … or solution …to the surge problem?

Thanks,
G

2

it’s an iac problem. did you try cleaning the port in the throttle body?