Now you might think that spraying lighter gas not far off from a hot engine isnt wise, however the flash /ignition reduction of gas is about 400C consequently you obsession a naked fire or spark to set it off and Ive used this method for many years without incident. produce a result your exaggeration through each possible joint one at a get older 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 offer a spraying wand and allow a talk to blast of gas into each area, especially those difficult to reach when large implements.
Its along with worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a ill pump will every upshot in insufficient fuel swine delivered to the engine. Might as a consequence be worth cleaning out the idle keenness run motor / valve as these get clogged stirring bearing in mind 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 going on to date upon all 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 law many factors may cause the same symptom(s)