seanw8594 Posted February 26, 2008 Share Posted February 26, 2008 I HAVE A 90 LS 400 THE CAR WOULD NOT PASS 2000 RPM I CHANGED THE TWO CATALYTIC CONVERTERS BY THE MANIFOLD AND NOW THE DRIVES BUT IT ACCELERATE SLOWLY I AM WONDERING IF THE MUFFLER IS CLOGED PLEASE HELP ??? Quote Link to comment Share on other sites More sharing options...
jcrome04 Posted February 27, 2008 Share Posted February 27, 2008 Try having your injectors pulled and cleaned out REAAAAAAAAAAAAAAAAAL good! Quote Link to comment Share on other sites More sharing options...
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