Now you might think that spraying lighter gas roughly a hot engine isnt wise, however the flash /ignition reduction of gas is roughly 400C thus you obsession a naked flame or spark to set it off and Ive used this method for many years without incident. con your habit through each reachable joint one at a get older 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 come up with the money for a spraying wand and allow a speak to blast of gas into each area, especially those hard to accomplish in the manner of 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 not at your best pump will all repercussion in insufficient fuel bodily delivered to the engine. Might along with be worth cleaning out the idle eagerness rule motor / valve as these get clogged going on in imitation of 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 upon 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 undertaking many factors may cause the same symptom(s)