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GL1500 misfiring

1931 Views 4 Replies 5 Participants Last post by  FM
Hi All
I have a 1992 se 1500
about two weeks ago on start up I noticed (heard) a misfire after the engine warmed up the misfire disappear to my relief
Well it has become progressively worse
I have replaced the spark plugs ( it actually sounds worse)I have checked the spark on each plug and they all seem to be operating Stumped!
I need some advice on what the next step should be
Any assistance will be much appreciated
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If you can't isolate which cylinder is misfiring, that makes things difficult.
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