Join Date: Feb 2018
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Thank you for all the responses, today I pulled the EGR off and cleaned it, there was very little build up (just a surface coating, intake that I could see was the same), I have not pulled the intake. I put it back together and started it idle was about 1100, after 5 minutes I gave it a little gas and it started it's 500 rpm surge, I covered up the IACV port and the surging slowly went away (10sec). When covered the rpms did not change much and it did not stall out, I realized I could then work the throttle and it would stay at a 1400-1500 very slow surge. I went for a drive and it ran good, came back steady 1500 rpm, turned it off, started it touched the gas and the 500 surge came back.
For the throttle body I pulled it loose and cleaned everything I had access to, IACV was off at this time MAP and TPS was still attached. I did not remove the cables or adjust them, I have also used my finger to insure it was fully closed when running.
Because of the higher RPM adding propane does nothing to show a leak. I have visually checked the vacuum lines and connections and nothing stands out. I would also think that a vacuum leak the problems should remain consistent. This car ran fine before it sat for several weeks, and I noticed it when I stopped to wash the underside 2 miles from my friends home. I have asked my friend if it did this before and he said no. When I changed the IACV the behavior completely changed, when I put the old one back if things went back to how it was.
I do not have a scanner, no P0505 code.
As I stated earlier when I start the car the rpms go to 2000 and slowly drop to 1100, the car is in a basement garage so its not out in the cold, but it does this even after it is warmed up, so is this normal.
I agree it is possibly another sensor, but I don't want to throw money randomly replacing sensors and don't really want to take it to the dealer.
Because of my work schedule I do not have the opportunity to work on it everyday, again thank you for the recommendations any thoughts what I should try now?