G,
Do not understand fine adjustment of throttle valve actuator. If you are talking about the solenoid on top of the intake, there is no fine adjustment for manifold heat. I believe you have an automatic and are referring to the solenoid that increases idle in gear. I suggest you check the throttle blade clearance. You can do this by removing the air cleaner hose, sliding a cigarette pack wrapper between the blade and housing, and adjusting the screw until it slides through with little resistance. Although the protractor sets are no lomger available, but you can still set basic linkage by lining up the hole in the intake manifold with the one bell crank on the cross bar facing that direction. Secure the cross bar in this position and adjust all rods to fit tension free. To answer your question, if you can't blow through that filter with no resistance, it needs to be replaced. I'll bet yours is plugged solid. Start crying now when you check the price of one of those puppies.

Peter

__________________
Auto Zentral Ltd.