Hello, I have repaired over 30000 vehicles in my career and I habit to ask you questions since I am not there in person to hoard facts, data, or to exam your vehicle. I may ask you to fake scrutiny in my stead. If chemical analysis is needed and you would rather not show testing, I can provide my best advice, Fuel pressure?
I started the car occurring this morning, it starts up and runs at 1750 and within a minute or for that reason climbs beyond 2500.. It is government serene though, just exaggeration unconventional than it should be. I moreover checked the throttle screw plate/return screw, deliberately turned it out and nothing changed. put it support to exactly where it was. No vacuum leak sounds and every links verified. I feel fine about them as I've been in there a bunch of times..
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you stirring to date upon every maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms up and is warmed up? oftentimes in engine show many factors may cause the similar symptom(s)