Now you might think that spraying lighter gas regarding a warm engine isnt wise, however the flash /ignition point of gas is virtually 400C therefore you need a naked flare or spark to set it off and Ive used this method for many years without incident. perform your showing off through each practicable joint one at a grow old and you should find it. I use a slightly flattened fragment of brake pipe and some rubber hose from the can of lighter gas to come up with the money for a spraying wand and allow a deal with blast of gas into each area, especially those hard to achieve considering large implements.
Its also worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a sick pump will all upshot in insufficient fuel innate delivered to the engine. Might plus be worth cleaning out the idle keenness rule motor / valve as these get clogged taking place as soon as carbon and some brake cleaner washed through helps clear things off.
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you happening 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 accomplish many factors may cause the same symptom(s)