NO! You should always clean it prior to testing. I clean mine every year, as it's a common cause for pooching up your idle.

Your Throttle set screw should never be tampered with. If it has been, you will commonly get a TPS voltage higher than expected at idle error code.

 

So how do I fix the throttle screw problem?

 

And do I need to just go ahead and replace the IAC or should I give cleaning it out a shot?

 

Read what I post! Click & read the links I post!

 

x2. THINK WITH YOUR DIPSTICK! Sorry....saw you changed your pic and stuff....couldn't help myself...

 

Sums it up!