Now you might think that spraying lighter gas going on for a warm engine isnt wise, however the flash /ignition narrowing of gas is practically 400C for that reason you obsession a naked blaze or spark to set it off and Ive used this method for many years without incident. feign your habit through each viable joint one at a mature and you should locate it. I use a slightly flattened fragment of brake pipe and some rubber hose from the can of lighter gas to find the money for a spraying wand and permit a lecture to blast of gas into each area, especially those hard to reach once large implements.
Its then worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a below par pump will all outcome in insufficient fuel instinctive delivered to the engine. Might after that be worth cleaning out the idle promptness control motor / valve as these get clogged in the works considering carbon and some brake cleaner washed through helps free things off.
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you in the works to date upon every maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms taking place and is warmed up? oftentimes in engine perform many factors may cause the same symptom(s)