Now you might think that spraying lighter gas nearly a warm engine isnt wise, however the flash /ignition point of gas is more or less 400C suitably you need a naked blaze or spark to set it off and Ive used this method for many years without incident. deed your way through each attainable joint one at a times and you should locate it. I use a slightly flattened piece of brake pipe and some rubber hose from the can of lighter gas to manage to pay for a spraying wand and allow a focus on blast of gas into each area, especially those difficult to reach behind large implements.
I started the car taking place this morning, it starts happening and runs at 1750 and within a minute or so climbs beyond 2500.. It is direction serene though, just quirk well along than it should be. I after that checked the throttle screw plate/return screw, with intent turned it out and nothing changed. put it put up to to exactly where it was. No vacuum leak sounds and every associates verified. I character good not quite 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 up 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 stirring and is warmed up? oftentimes in engine do something many factors may cause the similar symptom(s)