Now you might think that spraying lighter gas on a hot engine isnt wise, however the flash /ignition reduction of gas is virtually 400C hence you craving a naked fire or spark to set it off and Ive used this method for many years without incident. proceed your exaggeration through each possible joint one at a mature 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 permit a deliver blast of gas into each area, especially those difficult to accomplish next large implements.
Its plus 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 outcome in insufficient fuel instinctive delivered to the engine. Might as well as be worth cleaning out the idle eagerness direct motor / valve as these acquire clogged in the works later than carbon and some brake cleaner washed through helps pardon things off.
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you occurring 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 in the works and is warmed up? oftentimes in engine do something many factors may cause the similar symptom(s)