Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
I'm pulling codes from cluster (i'd love to find the way to pull datastream with my obd2 launch scanner).
Codes are 327 (evp or dpfe) and 565 (canister purge circuit). Please bear in mind purge line and egr were cancelled, so i think they are not related with rough idle. Are you agree?
Customer told me that when rough idle began, he heard a "tick" sound, like a solenoid. I can't still relate the sound with the issue, since it doesn't have purge valve, neither egr valve.
That sounds normal. If the engine is struggling to run, adding load will make it worse.
You really need to get direction on the problem. Is it not enough fuel, too much air, missing spark, etc.
Here's an easy one. Do a cylinder drop test by pulling plug wires one at a time (off the distributor cap so you don't get zapped). See which ones do or don't cause a change in the idle speed.
