Fellas, need all of your great minds to come together and help me diagnose a low idle shutter in my 2000 Ford Focus. Yes, i know it is a focus and a ford and there starts my problems, but, it is a secondary car for us and we got it at a great price.... so here it goes:
Car has 72k miles. I have replaced plugs and wires with NGK plugs gapped at 050ish. I have run Seafoam through the vacuum lines several times to make sure i get all the carbon out of the intake system. I have also can techron and BG44K through 4 tanks of gas to make sure my fuel system is "cleaned". I have also replaced my fuel filter and air intake filter. I have removed and cleaned my idle air control valve, replaced my PCV valve and hose, checked all vacuum lines for leaks (did the old school method of spraying carb cleaner at connection points and lines and listened for drop in rpm), and cleaned my MAF sens with CFC cleaner with no luck. Checked my throttle position sensor for correct readings, bypassed my EGR valve and have also disconnected and reconnected my MAF sensor with no changes.
I am slowly coming to a loss as to what could be going on. The focus forum sucks for info IMO.
So fellas, besides telling me to take it to a mechanic... please help me out and let me know what yall would check and i will gladly do my best and report back what happens....