K9crew Posted July 25, 2005 Share Posted July 25, 2005 My '99 LS has been trouble free for 20k miles (bought at 58K now at 79K) but in the past few weeks I've noticed a slight stumble in N or P but not in D. When I'm waiting at a light I usually put the transmission in N (sometimes P if I know it'll be a while) to reduce heat in the tranny. I've been experiencing an intermittent stumble in the engine when doing this. Does this sound like a vacuum leak? What's the best approach to finding a vacuum leak? What else could be the cause? Thanks :) Quote Link to comment Share on other sites More sharing options...
K9crew Posted July 28, 2005 Author Share Posted July 28, 2005 BTT BTW ... I changed plugs, fuel filter, air filter, pcv valve, oil and oil filter in the past few months. :) Quote Link to comment Share on other sites More sharing options...
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