Hello, I have repaired greater than 30000 vehicles in my career and I obsession to question you questions previously I am not there in person to hoard facts, data, or to test your vehicle. I may ask you to play chemical analysis in my stead. If investigation is needed and you would rather not performance testing, I can provide my best advice, Fuel pressure?
I started the car in the works this morning, it starts in the works and runs at 1750 and within a minute or hence climbs higher than 2500.. It is doling out serene though, just artifice future than it should be. I plus checked the throttle screw plate/return screw, on purpose turned it out and nothing changed. put it encourage to exactly where it was. No vacuum leak sounds and every connections verified. I air fine more or less 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 on all maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms going on and is warmed up? oftentimes in engine feat many factors may cause the similar symptom(s)